Confused pairs
Incorrect answers between two species (undirected). With a country selected, only mix-ups from games in that country are counted, and only pairs where both species are on that country's checklist are shown.
| Species A (lower id) | Species B (higher id) | Total wrong | A was target → picked B | B was target → picked A |
|---|---|---|---|---|
| Siberian Sand Plover Anarhynchus mongolus | Greater Sand Plover Anarhynchus leschenaultii | 9 | 5 | 4 |
| Taiga Bean Goose Anser fabalis | Tundra Bean Goose Anser serrirostris | 9 | 3 | 6 |
| Common Sandpiper Actitis hypoleucos | Green Sandpiper Tringa ochropus | 8 | 4 | 4 |
| Laysan Albatross Phoebastria immutabilis | Short-tailed Albatross Phoebastria albatrus | 8 | 2 | 6 |
| Bar-tailed Godwit Limosa lapponica | Black-tailed Godwit Limosa limosa | 8 | 4 | 4 |
| Long-tailed Rosefinch Carpodacus sibiricus | Pallas's Rosefinch Carpodacus roseus | 8 | 5 | 3 |
| Common Cuckoo Cuculus canorus | Oriental Cuckoo Cuculus optatus | 7 | 5 | 2 |
| Grey Phalarope Phalaropus fulicarius | Red-necked Phalarope Phalaropus lobatus | 7 | 5 | 2 |
| Flesh-footed Shearwater Ardenna carneipes | Sooty Shearwater Ardenna grisea | 7 | 6 | 1 |
| Ryukyu Minivet Pericrocotus tegimae | Ashy Minivet Pericrocotus divaricatus | 7 | 4 | 3 |
| Spectacled Guillemot Cepphus carbo | Pigeon Guillemot Cepphus columba | 7 | 6 | 1 |
| Ryukyu Scops Owl Otus elegans | Oriental Scops Owl Otus sunia | 6 | 3 | 3 |
| Iriomote Tit Sittiparus olivaceus | Owston's Tit Sittiparus owstoni | 6 | 4 | 2 |
| Bonin White-eye Apalopteron familiare | Warbling White-eye Zosterops japonicus | 6 | 1 | 5 |
| Bewick's Swan Cygnus columbianus | Whooper Swan Cygnus cygnus | 6 | 5 | 1 |
| Iriomote Tit Sittiparus olivaceus | Varied Tit Sittiparus varius | 5 | 4 | 1 |
| Pin-tailed Snipe Gallinago stenura | Latham's Snipe Gallinago hardwickii | 5 | 3 | 2 |
| Long-billed Murrelet Brachyramphus perdix | Pigeon Guillemot Cepphus columba | 5 | 5 | 0 |
| Eurasian Sparrowhawk Accipiter nisus | Eurasian Goshawk Astur gentilis | 5 | 4 | 1 |
| Alpine Accentor Prunella collaris | Japanese Accentor Prunella rubida | 5 | 5 | 0 |
| Eurasian Woodcock Scolopax rusticola | Amami Woodcock Scolopax mira | 5 | 4 | 1 |
| Dark-sided Flycatcher Muscicapa sibirica | Asian Brown Flycatcher Muscicapa dauurica | 5 | 2 | 3 |
| White-naped Crane Antigone vipio | Hooded Crane Grus monacha | 5 | 1 | 4 |
| Solitary Snipe Gallinago solitaria | Latham's Snipe Gallinago hardwickii | 5 | 5 | 0 |
| Bull-headed Shrike Lanius bucephalus | Brown Shrike Lanius cristatus | 5 | 4 | 1 |
| Crested Serpent-Eagle Spilornis cheela | Mountain Hawk-Eagle Nisaetus nipalensis | 5 | 1 | 4 |
| Brown-cheeked Rail Rallus indicus | Okinawa Rail Gallirallus okinawae | 5 | 5 | 0 |
| Red-necked Stint Calidris ruficollis | Sanderling Calidris alba | 5 | 2 | 3 |
| Yellow-billed Grosbeak Eophona migratoria | Japanese Grosbeak Eophona personata | 5 | 2 | 3 |
| Great White Egret Ardea alba | Medium Egret Ardea intermedia | 4 | 2 | 2 |
| Amami Woodcock Scolopax mira | Swinhoe's Snipe Gallinago megala | 4 | 2 | 2 |
| Asian Emerald Dove Chalcophaps indica | Whistling Green-Pigeon Treron formosae | 4 | 0 | 4 |
| Crested Honey-buzzard Pernis ptilorhynchus | Crested Serpent-Eagle Spilornis cheela | 4 | 2 | 2 |
| Leach's Storm-Petrel Hydrobates leucorhous | Band-rumped Storm-Petrel Hydrobates castro | 4 | 0 | 4 |
| Japanese Robin Larvivora akahige | Izu Robin Larvivora tanensis | 4 | 1 | 3 |
| Ryukyu Robin Larvivora komadori | Okinawa Robin Larvivora namiyei | 4 | 2 | 2 |
| Solitary Snipe Gallinago solitaria | Swinhoe's Snipe Gallinago megala | 4 | 2 | 2 |
| Glaucous Gull Larus hyperboreus | Glaucous-winged Gull Larus glaucescens | 4 | 3 | 1 |
| Little Ringed Plover Thinornis dubius | Long-billed Plover Thinornis placidus | 4 | 1 | 3 |
| Kamchatka Leaf Warbler Phylloscopus examinandus | Japanese Bush Warbler Horornis diphone | 4 | 0 | 4 |
| Bohemian Waxwing Bombycilla garrulus | Japanese Waxwing Bombycilla japonica | 4 | 4 | 0 |
| Grey Wagtail Motacilla cinerea | Eastern Yellow Wagtail Motacilla tschutschensis | 4 | 1 | 3 |
| Brown-eared Bulbul Hypsipetes amaurotis | Light-vented Bulbul Pycnonotus sinensis | 4 | 0 | 4 |
| Sooty Tern Onychoprion fuscatus | Bridled Tern Onychoprion anaethetus | 4 | 2 | 2 |
| Pin-tailed Snipe Gallinago stenura | Common Snipe Gallinago gallinago | 4 | 3 | 1 |
| Goosander Mergus merganser | Red-breasted Merganser Mergus serrator | 4 | 4 | 0 |
| Japanese Scops Owl Otus semitorques | Ryukyu Scops Owl Otus elegans | 4 | 4 | 0 |
| White's Thrush Zoothera aurea | Amami Thrush Zoothera major | 4 | 0 | 4 |
| White-throated Needletail Hirundapus caudacutus | House Swift Apus nipalensis | 4 | 1 | 3 |
| Brünnich's Guillemot Uria lomvia | Common Guillemot Uria aalge | 4 | 4 | 0 |
| Common Tern Sterna hirundo | Roseate Tern Sterna dougallii | 4 | 1 | 3 |
| Far Eastern Curlew Numenius madagascariensis | Eurasian Curlew Numenius arquata | 4 | 2 | 2 |
| Sooty Shearwater Ardenna grisea | Short-tailed Shearwater Ardenna tenuirostris | 4 | 0 | 4 |
| Siberian Thrush Geokichla sibirica | Eyebrowed Thrush Turdus obscurus | 4 | 4 | 0 |
| Meadow Bunting Emberiza cioides | Pine Bunting Emberiza leucocephalos | 4 | 1 | 3 |
| Black-throated Diver Gavia arctica | Pacific Diver Gavia pacifica | 4 | 1 | 3 |
| Bryan's Shearwater Puffinus bryani | Tropical Shearwater Puffinus bailloni | 4 | 2 | 2 |
| Common Ringed Plover Charadrius hiaticula | Little Ringed Plover Thinornis dubius | 4 | 2 | 2 |
| Grey-streaked Flycatcher Muscicapa griseisticta | Asian Brown Flycatcher Muscicapa dauurica | 4 | 4 | 0 |
| Japanese Leaf Warbler Phylloscopus xanthodryas | Kamchatka Leaf Warbler Phylloscopus examinandus | 3 | 0 | 3 |
| Arctic Skua Stercorarius parasiticus | South Polar Skua Stercorarius maccormicki | 3 | 0 | 3 |
| Narcissus Flycatcher Ficedula narcissina | Mugimaki Flycatcher Ficedula mugimaki | 3 | 1 | 2 |
| Marsh Tit Poecile palustris | Willow Tit Poecile montanus | 3 | 2 | 1 |
| Common Gull Larus canus | Short-billed Gull Larus brachyrhynchus | 3 | 0 | 3 |
| Coal Tit Periparus ater | Iriomote Tit Sittiparus olivaceus | 3 | 3 | 0 |
| Matsudaira's Storm-Petrel Hydrobates matsudairae | Tristram's Storm-Petrel Hydrobates tristrami | 3 | 1 | 2 |
| Common Redshank Tringa totanus | Spotted Redshank Tringa erythropus | 3 | 2 | 1 |
| Pale Thrush Turdus pallidus | Dusky Thrush Turdus eunomus | 3 | 3 | 0 |
| Lapland Bunting Calcarius lapponicus | Snow Bunting Plectrophenax nivalis | 3 | 2 | 1 |
| Middendorff's Grasshopper Warbler Helopsaltes ochotensis | Pleske's Grasshopper Warbler Helopsaltes pleskei | 3 | 0 | 3 |
| Chestnut-eared Bunting Emberiza fucata | Meadow Bunting Emberiza cioides | 3 | 0 | 3 |
| Eastern Crowned Warbler Phylloscopus coronatus | Sakhalin Leaf Warbler Phylloscopus borealoides | 3 | 2 | 1 |
| Crested Serpent-Eagle Spilornis cheela | Grey-faced Buzzard Butastur indicus | 3 | 0 | 3 |
| Leach's Storm-Petrel Hydrobates leucorhous | Matsudaira's Storm-Petrel Hydrobates matsudairae | 3 | 3 | 0 |
| Japanese Pygmy Woodpecker Yungipicus kizuki | Okinawa Woodpecker Dendrocopos noguchii | 3 | 2 | 1 |
| Sakhalin Leaf Warbler Phylloscopus borealoides | Japanese Leaf Warbler Phylloscopus xanthodryas | 3 | 2 | 1 |
| Great Cormorant Phalacrocorax carbo | Japanese Cormorant Phalacrocorax capillatus | 3 | 2 | 1 |
| Eastern Marsh Harrier Circus spilonotus | Hen Harrier Circus cyaneus | 3 | 0 | 3 |
| Baird's Sandpiper Calidris bairdii | White-rumped Sandpiper Calidris fuscicollis | 3 | 1 | 2 |
| Japanese Thrush Turdus cardis | Izu Thrush Turdus celaenops | 3 | 2 | 1 |
| Lesser Spotted Woodpecker Dryobates minor | Japanese Woodpecker Picus awokera | 3 | 3 | 0 |
| Asian Dowitcher Limnodromus semipalmatus | Long-billed Dowitcher Limnodromus scolopaceus | 3 | 1 | 2 |
| Crested Honey-buzzard Pernis ptilorhynchus | Mountain Hawk-Eagle Nisaetus nipalensis | 3 | 2 | 1 |
| Tristram's Storm-Petrel Hydrobates tristrami | Bonin Petrel Pterodroma hypoleuca | 3 | 1 | 2 |
| Eyebrowed Thrush Turdus obscurus | Pale Thrush Turdus pallidus | 3 | 3 | 0 |
| Solitary Snipe Gallinago solitaria | Pin-tailed Snipe Gallinago stenura | 3 | 1 | 2 |
| Laysan Albatross Phoebastria immutabilis | Black-footed Albatross Phoebastria nigripes | 3 | 0 | 3 |
| Rough-legged Buzzard Buteo lagopus | Eastern Buzzard Buteo japonicus | 3 | 2 | 1 |
| Band-rumped Storm-Petrel Hydrobates castro | Matsudaira's Storm-Petrel Hydrobates matsudairae | 3 | 3 | 0 |
| Yellow Bunting Emberiza sulphurata | Masked Bunting Emberiza personata | 3 | 1 | 2 |
| Latham's Snipe Gallinago hardwickii | Common Snipe Gallinago gallinago | 3 | 2 | 1 |
| Brown-headed Thrush Turdus chrysolaus | Pale Thrush Turdus pallidus | 3 | 0 | 3 |
| Japanese Scops Owl Otus semitorques | Oriental Scops Owl Otus sunia | 3 | 2 | 1 |
| Long-billed Plover Thinornis placidus | Grey-headed Lapwing Vanellus cinereus | 3 | 2 | 1 |
| Bonin Petrel Pterodroma hypoleuca | Bulwer's Petrel Bulweria bulwerii | 3 | 0 | 3 |
| Cinnamon Bittern Botaurus cinnamomeus | Yellow Bittern Botaurus sinensis | 3 | 2 | 1 |
| Pacific Swallow Hirundo javanica | Red-rumped Swallow Cecropis daurica | 3 | 3 | 0 |
| Chinese Sparrowhawk Tachyspiza soloensis | Japanese Sparrowhawk Tachyspiza gularis | 3 | 2 | 1 |
| Common Rosefinch Carpodacus erythrinus | Pallas's Rosefinch Carpodacus roseus | 3 | 1 | 2 |
| Swinhoe's Storm-Petrel Hydrobates monorhis | Matsudaira's Storm-Petrel Hydrobates matsudairae | 3 | 2 | 1 |
| Chestnut-cheeked Starling Agropsar philippensis | White-cheeked Starling Spodiopsar cineraceus | 3 | 0 | 3 |
| Pine Grosbeak Pinicola enucleator | Asian Rosy-Finch Leucosticte arctoa | 3 | 3 | 0 |
| Common Redpoll Acanthis flammea | Eurasian Siskin Spinus spinus | 2 | 1 | 1 |
| Black-capped Kingfisher Halcyon pileata | Crested Kingfisher Megaceryle lugubris | 2 | 0 | 2 |
| Common Sandpiper Actitis hypoleucos | Grey-tailed Tattler Tringa brevipes | 2 | 1 | 1 |
| Chestnut-eared Bunting Emberiza fucata | Pine Bunting Emberiza leucocephalos | 2 | 1 | 1 |
| Great Crested Tern Thalasseus bergii | Chinese Crested Tern Thalasseus bernsteini | 2 | 2 | 0 |
| Red-throated Diver Gavia stellata | Black-throated Diver Gavia arctica | 2 | 2 | 0 |
| White-backed Woodpecker Dendrocopos leucotos | Great Spotted Woodpecker Dendrocopos major | 2 | 2 | 0 |
| White-bellied Green-Pigeon Treron sieboldii | Whistling Green-Pigeon Treron formosae | 2 | 1 | 1 |
| Great Spotted Woodpecker Dendrocopos major | Lesser Spotted Woodpecker Dryobates minor | 2 | 1 | 1 |
| Green Sandpiper Tringa ochropus | Wood Sandpiper Tringa glareola | 2 | 2 | 0 |
| Japanese Woodpecker Picus awokera | Grey-headed Woodpecker Picus canus | 2 | 1 | 1 |
| Grey-tailed Tattler Tringa brevipes | Wandering Tattler Tringa incana | 2 | 1 | 1 |
| Merlin Falco columbarius | Eurasian Hobby Falco subbuteo | 2 | 1 | 1 |
| Yellow Bunting Emberiza sulphurata | Black-faced Bunting Emberiza spodocephala | 2 | 1 | 1 |
| Fairy Pitta Pitta nympha | Ashy Minivet Pericrocotus divaricatus | 2 | 2 | 0 |
| Black-faced Bunting Emberiza spodocephala | Masked Bunting Emberiza personata | 2 | 0 | 2 |
| Common Crane Grus grus | Red-crowned Crane Grus japonensis | 2 | 0 | 2 |
| Ferruginous Duck Aythya nyroca | Baer's Pochard Aythya baeri | 2 | 1 | 1 |
| Slavonian Grebe Podiceps auritus | Black-necked Grebe Podiceps nigricollis | 2 | 2 | 0 |
| Tristram's Bunting Emberiza tristrami | Grey Bunting Emberiza variabilis | 2 | 0 | 2 |
| White-crowned Sparrow Zonotrichia leucophrys | Golden-crowned Sparrow Zonotrichia atricapilla | 2 | 1 | 1 |
| Lesser Cuckoo Cuculus poliocephalus | Oriental Cuckoo Cuculus optatus | 2 | 2 | 0 |
| Tiger Shrike Lanius tigrinus | Bull-headed Shrike Lanius bucephalus | 2 | 1 | 1 |
| White-winged Scoter Melanitta deglandi | Stejneger's Scoter Melanitta stejnegeri | 2 | 2 | 0 |
| Yellow-rumped Warbler Setophaga coronata | Wilson's Warbler Cardellina pusilla | 2 | 1 | 1 |
| Red-backed Shrike Lanius collurio | Brown Shrike Lanius cristatus | 2 | 2 | 0 |
| Brown Shrike Lanius cristatus | Northern Shrike Lanius borealis | 2 | 1 | 1 |
| Great Knot Calidris tenuirostris | Red Knot Calidris canutus | 2 | 0 | 2 |
| Northern Shrike Lanius borealis | Chinese Grey Shrike Lanius sphenocercus | 2 | 1 | 1 |
| Broad-billed Sandpiper Calidris falcinellus | Sharp-tailed Sandpiper Calidris acuminata | 2 | 2 | 0 |
| Rook Corvus frugilegus | Large-billed Crow Corvus macrorhynchos | 2 | 2 | 0 |
| Carrion Crow Corvus corone | Large-billed Crow Corvus macrorhynchos | 2 | 0 | 2 |
| Carrion Crow Corvus corone | Common Raven Corvus corax | 2 | 1 | 1 |
| Swinhoe's Storm-Petrel Hydrobates monorhis | Tristram's Storm-Petrel Hydrobates tristrami | 2 | 1 | 1 |
| Varied Tit Sittiparus varius | Japanese Tit Parus minor | 2 | 1 | 1 |
| White-throated Needletail Hirundapus caudacutus | Pacific Swift Apus pacificus | 2 | 1 | 1 |
| Tristram's Storm-Petrel Hydrobates tristrami | Bulwer's Petrel Bulweria bulwerii | 2 | 2 | 0 |
| Semipalmated Plover Charadrius semipalmatus | Little Ringed Plover Thinornis dubius | 2 | 1 | 1 |
| Temminck's Stint Calidris temminckii | Red-necked Stint Calidris ruficollis | 2 | 0 | 2 |
| Long-toed Stint Calidris subminuta | Dunlin Calidris alpina | 2 | 2 | 0 |
| Bonin Petrel Pterodroma hypoleuca | Black-winged Petrel Pterodroma nigripennis | 2 | 0 | 2 |
| Bonin Petrel Pterodroma hypoleuca | Streaked Shearwater Calonectris leucomelas | 2 | 0 | 2 |
| Black-browed Reed Warbler Acrocephalus bistrigiceps | Sedge Warbler Acrocephalus schoenobaenus | 2 | 0 | 2 |
| Black-browed Reed Warbler Acrocephalus bistrigiceps | Oriental Reed Warbler Acrocephalus orientalis | 2 | 1 | 1 |
| Oriental Reed Warbler Acrocephalus orientalis | Marsh Grassbird Helopsaltes pryeri | 2 | 0 | 2 |
| Oriental Reed Warbler Acrocephalus orientalis | Middendorff's Grasshopper Warbler Helopsaltes ochotensis | 2 | 2 | 0 |
| Himalayan Swiftlet Aerodramus brevirostris | Pacific Swift Apus pacificus | 2 | 2 | 0 |
| Stejneger's Scoter Melanitta stejnegeri | Black Scoter Melanitta americana | 2 | 1 | 1 |
| Sakhalin Grasshopper Warbler Helopsaltes amnicola | Pleske's Grasshopper Warbler Helopsaltes pleskei | 2 | 1 | 1 |
| Long-tailed Skua Stercorarius longicaudus | Arctic Skua Stercorarius parasiticus | 2 | 1 | 1 |
| Marsh Grassbird Helopsaltes pryeri | Lanceolated Warbler Locustella lanceolata | 2 | 2 | 0 |
| Streaked Shearwater Calonectris leucomelas | Wedge-tailed Shearwater Ardenna pacifica | 2 | 2 | 0 |
| Streaked Shearwater Calonectris leucomelas | Sooty Shearwater Ardenna grisea | 2 | 1 | 1 |
| Arctic Skua Stercorarius parasiticus | Pomarine Skua Stercorarius pomarinus | 2 | 2 | 0 |
| Pacific Swallow Hirundo javanica | Barn Swallow Hirundo rustica | 2 | 2 | 0 |
| Flesh-footed Shearwater Ardenna carneipes | Wedge-tailed Shearwater Ardenna pacifica | 2 | 0 | 2 |
| Yellow-browed Warbler Phylloscopus inornatus | Eastern Crowned Warbler Phylloscopus coronatus | 2 | 1 | 1 |
| Yellow-browed Warbler Phylloscopus inornatus | Sakhalin Leaf Warbler Phylloscopus borealoides | 2 | 2 | 0 |
| Wedge-tailed Shearwater Ardenna pacifica | Sooty Shearwater Ardenna grisea | 2 | 2 | 0 |
| Wedge-tailed Shearwater Ardenna pacifica | Bannerman's Shearwater Puffinus bannermani | 2 | 1 | 1 |
| Short-tailed Shearwater Ardenna tenuirostris | Bryan's Shearwater Puffinus bryani | 2 | 1 | 1 |
| Siberian Sand Plover Anarhynchus mongolus | Kentish Plover Anarhynchus alexandrinus | 2 | 1 | 1 |
| Pacific Swift Apus pacificus | House Swift Apus nipalensis | 2 | 1 | 1 |
| Lesser Frigatebird Fregata ariel | Great Frigatebird Fregata minor | 2 | 2 | 0 |
| Eastern Crowned Warbler Phylloscopus coronatus | Ijima's Leaf Warbler Phylloscopus ijimae | 2 | 1 | 1 |
| Masked Booby Sula dactylatra | Nazca Booby Sula granti | 2 | 0 | 2 |
| Least Auklet Aethia pusilla | Parakeet Auklet Aethia psittacula | 2 | 2 | 0 |
| Red-faced Cormorant Urile urile | Pelagic Cormorant Urile pelagicus | 2 | 2 | 0 |
| Ijima's Leaf Warbler Phylloscopus ijimae | Pale-legged Leaf Warbler Phylloscopus tenellipes | 2 | 1 | 1 |
| Pale-legged Leaf Warbler Phylloscopus tenellipes | Sakhalin Leaf Warbler Phylloscopus borealoides | 2 | 1 | 1 |
| Bristle-thighed Curlew Numenius tahitiensis | Whimbrel Numenius phaeopus | 2 | 2 | 0 |
| Sakhalin Leaf Warbler Phylloscopus borealoides | Kamchatka Leaf Warbler Phylloscopus examinandus | 2 | 2 | 0 |
| Common Goldeneye Bucephala clangula | Goosander Mergus merganser | 2 | 1 | 1 |
| Great White Pelican Pelecanus onocrotalus | Dalmatian Pelican Pelecanus crispus | 2 | 1 | 1 |
| Arctic Warbler Phylloscopus borealis | Kamchatka Leaf Warbler Phylloscopus examinandus | 2 | 1 | 1 |
| Arctic Warbler Phylloscopus borealis | Asian Stubtail Urosphena squameiceps | 2 | 1 | 1 |
| Eurasian Bittern Botaurus stellaris | Schrenck's Bittern Botaurus eurhythmus | 2 | 1 | 1 |
| Asian Stubtail Urosphena squameiceps | Japanese Bush Warbler Horornis diphone | 2 | 1 | 1 |
| Cinnamon Bittern Botaurus cinnamomeus | Schrenck's Bittern Botaurus eurhythmus | 2 | 1 | 1 |
| Daurian Starling Agropsar sturninus | White-shouldered Starling Sturnia sinensis | 2 | 2 | 0 |
| Chestnut-cheeked Starling Agropsar philippensis | White-shouldered Starling Sturnia sinensis | 2 | 1 | 1 |
| Schrenck's Bittern Botaurus eurhythmus | Malayan Night Heron Gorsachius melanolophus | 2 | 2 | 0 |
| Pigeon Guillemot Cepphus columba | Common Guillemot Uria aalge | 2 | 0 | 2 |
| White's Thrush Zoothera aurea | Siberian Thrush Geokichla sibirica | 2 | 0 | 2 |
| Amami Thrush Zoothera major | Japanese Thrush Turdus cardis | 2 | 1 | 1 |
| Pacific Reef-Heron Egretta sacra | Chinese Egret Egretta eulophotes | 2 | 1 | 1 |
| Ancient Murrelet Synthliboramphus antiquus | Japanese Murrelet Synthliboramphus wumizusume | 2 | 0 | 2 |
| Saunders's Gull Saundersilarus saundersi | Black-headed Gull Chroicocephalus ridibundus | 2 | 2 | 0 |
| Japanese Thrush Turdus cardis | Brown-headed Thrush Turdus chrysolaus | 2 | 0 | 2 |
| Slaty-legged Crake Rallina eurizonoides | Ruddy-breasted Crake Zapornia fusca | 2 | 2 | 0 |
| Brown-headed Thrush Turdus chrysolaus | Izu Thrush Turdus celaenops | 2 | 2 | 0 |
| Chinese Pond Heron Ardeola bacchus | Javan Pond Heron Ardeola speciosa | 2 | 0 | 2 |
| Izu Thrush Turdus celaenops | Pale Thrush Turdus pallidus | 2 | 0 | 2 |
| Jack Snipe Lymnocryptes minimus | Solitary Snipe Gallinago solitaria | 2 | 2 | 0 |
| Grey-streaked Flycatcher Muscicapa griseisticta | Dark-sided Flycatcher Muscicapa sibirica | 2 | 1 | 1 |
| Amami Woodcock Scolopax mira | Solitary Snipe Gallinago solitaria | 2 | 0 | 2 |
| Rufous-tailed Robin Larvivora sibilans | Siberian Rubythroat Calliope calliope | 2 | 2 | 0 |
| Japanese Robin Larvivora akahige | Ryukyu Robin Larvivora komadori | 2 | 1 | 1 |
| Mountain Hawk-Eagle Nisaetus nipalensis | Grey-faced Buzzard Butastur indicus | 2 | 1 | 1 |
| Izu Robin Larvivora tanensis | Ryukyu Robin Larvivora komadori | 2 | 1 | 1 |
| Red-flanked Bluetail Tarsiger cyanurus | Ryukyu Flycatcher Ficedula owstoni | 2 | 2 | 0 |
| Glaucous-winged Gull Larus glaucescens | Slaty-backed Gull Larus schistisagus | 2 | 1 | 1 |
| Yellow-rumped Flycatcher Ficedula zanthopygia | Mugimaki Flycatcher Ficedula mugimaki | 2 | 2 | 0 |
| Copper Pheasant Syrmaticus soemmerringii | Green Pheasant Phasianus versicolor | 2 | 0 | 2 |
| Ryukyu Flycatcher Ficedula owstoni | Mugimaki Flycatcher Ficedula mugimaki | 2 | 2 | 0 |
| Swinhoe's Snipe Gallinago megala | Pin-tailed Snipe Gallinago stenura | 2 | 0 | 2 |
| Swinhoe's Snipe Gallinago megala | Latham's Snipe Gallinago hardwickii | 2 | 1 | 1 |
| Taiga Flycatcher Ficedula albicilla | Red-breasted Flycatcher Ficedula parva | 2 | 1 | 1 |
| Common Redstart Phoenicurus phoenicurus | Daurian Redstart Phoenicurus auroreus | 2 | 0 | 2 |
| Chinese Sparrowhawk Tachyspiza soloensis | Eurasian Sparrowhawk Accipiter nisus | 2 | 1 | 1 |
| Japanese Sparrowhawk Tachyspiza gularis | Eurasian Goshawk Astur gentilis | 2 | 1 | 1 |
| Isabelline Wheatear Oenanthe isabellina | Desert Wheatear Oenanthe deserti | 2 | 1 | 1 |
| Aleutian Tern Onychoprion aleuticus | Little Tern Sternula albifrons | 2 | 2 | 0 |
| Russet Sparrow Passer cinnamomeus | Eurasian Tree Sparrow Passer montanus | 2 | 2 | 0 |
| Western Yellow Wagtail Motacilla flava | Eastern Yellow Wagtail Motacilla tschutschensis | 2 | 2 | 0 |
| Steller's Sea-Eagle Haliaeetus pelagicus | White-tailed Eagle Haliaeetus albicilla | 2 | 1 | 1 |
| Richard's Pipit Anthus richardi | Blyth's Pipit Anthus godlewskii | 2 | 1 | 1 |
| Richard's Pipit Anthus richardi | Buff-bellied Pipit Anthus rubescens | 2 | 2 | 0 |
| Olive-backed Pipit Anthus hodgsoni | Buff-bellied Pipit Anthus rubescens | 2 | 0 | 2 |
| Red-throated Pipit Anthus cervinus | Buff-bellied Pipit Anthus rubescens | 2 | 1 | 1 |
| Pallas's Rosefinch Carpodacus roseus | Asian Rosy-Finch Leucosticte arctoa | 2 | 2 | 0 |
| Oriental Scops Owl Otus sunia | Blakiston's Fish-Owl Ketupa blakistoni | 2 | 1 | 1 |
| Ural Owl Strix uralensis | Long-eared Owl Asio otus | 2 | 0 | 2 |
| Ural Owl Strix uralensis | Short-eared Owl Asio flammeus | 2 | 2 | 0 |
| Common Tern Sterna hirundo | Black-naped Tern Sterna sumatrana | 2 | 2 | 0 |
| Long-eared Owl Asio otus | Short-eared Owl Asio flammeus | 2 | 2 | 0 |
| Pallas's Warbler Phylloscopus proregulus | Radde's Warbler Phylloscopus schwarzi | 1 | 1 | 0 |
| Pallas's Warbler Phylloscopus proregulus | Dusky Warbler Phylloscopus fuscatus | 1 | 0 | 1 |
| Pallas's Warbler Phylloscopus proregulus | Eastern Crowned Warbler Phylloscopus coronatus | 1 | 0 | 1 |
| Radde's Warbler Phylloscopus schwarzi | Dusky Warbler Phylloscopus fuscatus | 1 | 0 | 1 |
| Radde's Warbler Phylloscopus schwarzi | Sakhalin Leaf Warbler Phylloscopus borealoides | 1 | 1 | 0 |
| Tickell's Leaf Warbler Phylloscopus affinis | Common Chiffchaff Phylloscopus collybita | 1 | 1 | 0 |
| Dusky Warbler Phylloscopus fuscatus | Willow Warbler Phylloscopus trochilus | 1 | 1 | 0 |
| Dusky Warbler Phylloscopus fuscatus | Common Chiffchaff Phylloscopus collybita | 1 | 1 | 0 |
| Common Chiffchaff Phylloscopus collybita | Ijima's Leaf Warbler Phylloscopus ijimae | 1 | 1 | 0 |
| Eastern Crowned Warbler Phylloscopus coronatus | Two-barred Warbler Phylloscopus plumbeitarsus | 1 | 1 | 0 |
| Eastern Crowned Warbler Phylloscopus coronatus | Japanese Leaf Warbler Phylloscopus xanthodryas | 1 | 1 | 0 |
| Eastern Crowned Warbler Phylloscopus coronatus | Kamchatka Leaf Warbler Phylloscopus examinandus | 1 | 0 | 1 |
| Ijima's Leaf Warbler Phylloscopus ijimae | Arctic Warbler Phylloscopus borealis | 1 | 1 | 0 |
| Two-barred Warbler Phylloscopus plumbeitarsus | Arctic Warbler Phylloscopus borealis | 1 | 1 | 0 |
| Pale-legged Leaf Warbler Phylloscopus tenellipes | Arctic Warbler Phylloscopus borealis | 1 | 1 | 0 |
| Sakhalin Leaf Warbler Phylloscopus borealoides | Arctic Warbler Phylloscopus borealis | 1 | 1 | 0 |
| Japanese Leaf Warbler Phylloscopus xanthodryas | Arctic Warbler Phylloscopus borealis | 1 | 0 | 1 |
| Japanese Leaf Warbler Phylloscopus xanthodryas | Japanese Bush Warbler Horornis diphone | 1 | 0 | 1 |
| Kamchatka Leaf Warbler Phylloscopus examinandus | Asian Stubtail Urosphena squameiceps | 1 | 0 | 1 |
| Asian Stubtail Urosphena squameiceps | Long-tailed Tit Aegithalos caudatus | 1 | 1 | 0 |
| Lesser Whitethroat Curruca curruca | Common Whitethroat Curruca communis | 1 | 1 | 0 |
| Eurasian Nuthatch Sitta europaea | Eurasian Treecreeper Certhia familiaris | 1 | 1 | 0 |
| Eurasian Nuthatch Sitta europaea | Brown Dipper Cinclus pallasii | 1 | 1 | 0 |
| Common Starling Sturnus vulgaris | Rose-coloured Starling Pastor roseus | 1 | 0 | 1 |
| White-shouldered Starling Sturnia sinensis | Amami Thrush Zoothera major | 1 | 1 | 0 |
| White-cheeked Starling Spodiopsar cineraceus | Eurasian Siskin Spinus spinus | 1 | 1 | 0 |
| White's Thrush Zoothera aurea | Japanese Thrush Turdus cardis | 1 | 1 | 0 |
| Amami Thrush Zoothera major | Siberian Thrush Geokichla sibirica | 1 | 1 | 0 |
| Siberian Thrush Geokichla sibirica | Song Thrush Turdus philomelos | 1 | 1 | 0 |
| Song Thrush Turdus philomelos | Chinese Blackbird Turdus mandarinus | 1 | 1 | 0 |
| Chinese Blackbird Turdus mandarinus | Naumann's Thrush Turdus naumanni | 1 | 0 | 1 |
| Japanese Thrush Turdus cardis | Grey-backed Thrush Turdus hortulorum | 1 | 0 | 1 |
| Japanese Thrush Turdus cardis | Eyebrowed Thrush Turdus obscurus | 1 | 0 | 1 |
| Grey-backed Thrush Turdus hortulorum | Blue Rock Thrush Monticola solitarius | 1 | 1 | 0 |
| Eyebrowed Thrush Turdus obscurus | Brown-headed Thrush Turdus chrysolaus | 1 | 0 | 1 |
| Brown-headed Thrush Turdus chrysolaus | Dusky Thrush Turdus eunomus | 1 | 1 | 0 |
| Fieldfare Turdus pilaris | Red-throated Thrush Turdus ruficollis | 1 | 1 | 0 |
| Dusky Thrush Turdus eunomus | Naumann's Thrush Turdus naumanni | 1 | 0 | 1 |
| Dark-sided Flycatcher Muscicapa sibirica | Izu Robin Larvivora tanensis | 1 | 1 | 0 |
| Asian Brown Flycatcher Muscicapa dauurica | Rufous-tailed Robin Larvivora sibilans | 1 | 0 | 1 |
| Fujian Niltava Niltava davidi | Taiwan Vivid Niltava Niltava vivida | 1 | 1 | 0 |
| Blue-and-white Flycatcher Cyanoptila cyanomelana | Verditer Flycatcher Eumyias thalassinus | 1 | 0 | 1 |
| Blue-and-white Flycatcher Cyanoptila cyanomelana | European Robin Erithacus rubecula | 1 | 1 | 0 |
| Rufous-tailed Robin Larvivora sibilans | Japanese Robin Larvivora akahige | 1 | 1 | 0 |
| Rufous-tailed Robin Larvivora sibilans | Izu Robin Larvivora tanensis | 1 | 1 | 0 |
| Rufous-tailed Robin Larvivora sibilans | Ryukyu Robin Larvivora komadori | 1 | 1 | 0 |
| Japanese Robin Larvivora akahige | Okinawa Robin Larvivora namiyei | 1 | 1 | 0 |
| Izu Robin Larvivora tanensis | Okinawa Robin Larvivora namiyei | 1 | 0 | 1 |
| Okinawa Robin Larvivora namiyei | Bluethroat Luscinia svecica | 1 | 1 | 0 |
| Okinawa Robin Larvivora namiyei | Siberian Rubythroat Calliope calliope | 1 | 1 | 0 |
| Siberian Blue Robin Larvivora cyane | Red-flanked Bluetail Tarsiger cyanurus | 1 | 0 | 1 |
| Bluethroat Luscinia svecica | Siberian Rubythroat Calliope calliope | 1 | 1 | 0 |
| Siberian Rubythroat Calliope calliope | Chinese Rubythroat Calliope tschebaiewi | 1 | 0 | 1 |
| Yellow-rumped Flycatcher Ficedula zanthopygia | Narcissus Flycatcher Ficedula narcissina | 1 | 1 | 0 |
| Narcissus Flycatcher Ficedula narcissina | Ryukyu Flycatcher Ficedula owstoni | 1 | 1 | 0 |
| Mugimaki Flycatcher Ficedula mugimaki | Red-breasted Flycatcher Ficedula parva | 1 | 0 | 1 |
| Mugimaki Flycatcher Ficedula mugimaki | European Pied Flycatcher Ficedula hypoleuca | 1 | 1 | 0 |
| Black Redstart Phoenicurus ochruros | White-throated Rock Thrush Monticola gularis | 1 | 1 | 0 |
| Daurian Redstart Phoenicurus auroreus | Amur Stonechat Saxicola stejnegeri | 1 | 1 | 0 |
| Amur Stonechat Saxicola stejnegeri | Grey Bushchat Saxicola ferreus | 1 | 0 | 1 |
| Grey Bushchat Saxicola ferreus | Desert Wheatear Oenanthe deserti | 1 | 0 | 1 |
| Desert Wheatear Oenanthe deserti | Pied Wheatear Oenanthe pleschanka | 1 | 0 | 1 |
| Japanese Waxwing Bombycilla japonica | Japanese Accentor Prunella rubida | 1 | 0 | 1 |
| Eastern Yellow Wagtail Motacilla tschutschensis | Japanese Wagtail Motacilla grandis | 1 | 1 | 0 |
| Japanese Wagtail Motacilla grandis | Pied Wagtail/White Wagtail Motacilla alba | 1 | 0 | 1 |
| Richard's Pipit Anthus richardi | Olive-backed Pipit Anthus hodgsoni | 1 | 0 | 1 |
| Richard's Pipit Anthus richardi | Red-throated Pipit Anthus cervinus | 1 | 0 | 1 |
| Blyth's Pipit Anthus godlewskii | Olive-backed Pipit Anthus hodgsoni | 1 | 1 | 0 |
| Meadow Pipit Anthus pratensis | Pechora Pipit Anthus gustavi | 1 | 1 | 0 |
| Meadow Pipit Anthus pratensis | Water Pipit Anthus spinoletta | 1 | 0 | 1 |
| Water Pipit Anthus spinoletta | Buff-bellied Pipit Anthus rubescens | 1 | 1 | 0 |
| Brambling Fringilla montifringilla | Common Reed Bunting Emberiza schoeniclus | 1 | 1 | 0 |
| Pine Grosbeak Pinicola enucleator | Oriental Greenfinch Chloris sinica | 1 | 1 | 0 |
| Pine Grosbeak Pinicola enucleator | Golden-crowned Sparrow Zonotrichia atricapilla | 1 | 0 | 1 |
| Asian Rosy-Finch Leucosticte arctoa | Oriental Greenfinch Chloris sinica | 1 | 0 | 1 |
| Asian Rosy-Finch Leucosticte arctoa | Common Redpoll Acanthis flammea | 1 | 0 | 1 |
| Oriental Greenfinch Chloris sinica | Arctic Redpoll Acanthis hornemanni | 1 | 1 | 0 |
| Oriental Greenfinch Chloris sinica | Eurasian Siskin Spinus spinus | 1 | 1 | 0 |
| Common Redpoll Acanthis flammea | Common Crossbill Loxia curvirostra | 1 | 0 | 1 |
| Eurasian Siskin Spinus spinus | Snow Bunting Plectrophenax nivalis | 1 | 0 | 1 |
| Snow Bunting Plectrophenax nivalis | Meadow Bunting Emberiza cioides | 1 | 1 | 0 |
| Meadow Bunting Emberiza cioides | Yellow-throated Bunting Emberiza elegans | 1 | 1 | 0 |
| Meadow Bunting Emberiza cioides | Ochre-rumped Bunting Emberiza yessoensis | 1 | 1 | 0 |
| Pine Bunting Emberiza leucocephalos | Tristram's Bunting Emberiza tristrami | 1 | 0 | 1 |
| Yellow-throated Bunting Emberiza elegans | Yellow-browed Bunting Emberiza chrysophrys | 1 | 1 | 0 |
| Ochre-rumped Bunting Emberiza yessoensis | Pallas's Reed Bunting Emberiza pallasi | 1 | 1 | 0 |
| Ochre-rumped Bunting Emberiza yessoensis | Yellow-breasted Bunting Emberiza aureola | 1 | 1 | 0 |
| Ochre-rumped Bunting Emberiza yessoensis | Savannah Sparrow Passerculus sandwichensis | 1 | 1 | 0 |
| Common Reed Bunting Emberiza schoeniclus | Little Bunting Emberiza pusilla | 1 | 0 | 1 |
| Yellow-breasted Bunting Emberiza aureola | Rustic Bunting Emberiza rustica | 1 | 1 | 0 |
| Yellow-breasted Bunting Emberiza aureola | Yellow Bunting Emberiza sulphurata | 1 | 1 | 0 |
| Little Bunting Emberiza pusilla | Rustic Bunting Emberiza rustica | 1 | 1 | 0 |
| Rustic Bunting Emberiza rustica | Yellow Bunting Emberiza sulphurata | 1 | 0 | 1 |
| Rustic Bunting Emberiza rustica | Black-faced Bunting Emberiza spodocephala | 1 | 1 | 0 |
| Rustic Bunting Emberiza rustica | Yellow-browed Bunting Emberiza chrysophrys | 1 | 1 | 0 |
| Yellow Bunting Emberiza sulphurata | Chestnut Bunting Emberiza rutila | 1 | 1 | 0 |
| Black-faced Bunting Emberiza spodocephala | Chestnut Bunting Emberiza rutila | 1 | 0 | 1 |
| Black-faced Bunting Emberiza spodocephala | Tristram's Bunting Emberiza tristrami | 1 | 0 | 1 |
| Black-faced Bunting Emberiza spodocephala | Grey Bunting Emberiza variabilis | 1 | 1 | 0 |
| Masked Bunting Emberiza personata | Yellow-browed Bunting Emberiza chrysophrys | 1 | 1 | 0 |
| Chestnut Bunting Emberiza rutila | Tristram's Bunting Emberiza tristrami | 1 | 0 | 1 |
| Yellow-browed Bunting Emberiza chrysophrys | Tristram's Bunting Emberiza tristrami | 1 | 0 | 1 |
| Common Yellowthroat Geothlypis trichas | Yellow-rumped Warbler Setophaga coronata | 1 | 0 | 1 |
| Common Yellowthroat Geothlypis trichas | Wilson's Warbler Cardellina pusilla | 1 | 0 | 1 |
| Varied Tit Sittiparus varius | Owston's Tit Sittiparus owstoni | 1 | 1 | 0 |
| Greylag Goose Anser anser | Sakhalin Grasshopper Warbler Helopsaltes amnicola | 1 | 0 | 1 |
| Greater White-fronted Goose Anser albifrons | Lesser White-fronted Goose Anser erythropus | 1 | 1 | 0 |
| Greater White-fronted Goose Anser albifrons | Taiga Bean Goose Anser fabalis | 1 | 1 | 0 |
| Brent Goose Branta bernicla | Canada Goose Branta canadensis | 1 | 1 | 0 |
| Bewick's Swan Cygnus columbianus | Short-tailed Shearwater Ardenna tenuirostris | 1 | 1 | 0 |
| Ruddy Shelduck Tadorna ferruginea | Common Shelduck Tadorna tadorna | 1 | 0 | 1 |
| Common Shelduck Tadorna tadorna | Baikal Teal Sibirionetta formosa | 1 | 0 | 1 |
| Mandarin Duck Aix galericulata | Baikal Teal Sibirionetta formosa | 1 | 1 | 0 |
| Garganey Spatula querquedula | Gadwall Mareca strepera | 1 | 0 | 1 |
| Northern Shoveler Spatula clypeata | Eurasian Wigeon Mareca penelope | 1 | 1 | 0 |
| Northern Shoveler Spatula clypeata | Ring-necked Duck Aythya collaris | 1 | 0 | 1 |
| Northern Shoveler Spatula clypeata | Aleutian Tern Onychoprion aleuticus | 1 | 0 | 1 |
| Gadwall Mareca strepera | Falcated Duck Mareca falcata | 1 | 0 | 1 |
| Eurasian Wigeon Mareca penelope | Eastern Spot-billed Duck Anas zonorhyncha | 1 | 0 | 1 |
| Eurasian Wigeon Mareca penelope | Short-tailed Shearwater Ardenna tenuirostris | 1 | 1 | 0 |
| Eurasian Wigeon Mareca penelope | Grey-faced Buzzard Butastur indicus | 1 | 0 | 1 |
| Eastern Spot-billed Duck Anas zonorhyncha | Japanese Pygmy Woodpecker Yungipicus kizuki | 1 | 1 | 0 |
| Mallard Anas platyrhynchos | Northern Pintail Anas acuta | 1 | 1 | 0 |
| Northern Pintail Anas acuta | Eurasian Jay Garrulus glandarius | 1 | 0 | 1 |
| Tufted Duck Aythya fuligula | Greater Scaup Aythya marila | 1 | 1 | 0 |
| Steller's Eider Polysticta stelleri | Common Eider Somateria mollissima | 1 | 1 | 0 |
| Steller's Eider Polysticta stelleri | Harlequin Duck Histrionicus histrionicus | 1 | 1 | 0 |
| Stejneger's Scoter Melanitta stejnegeri | Long-tailed Duck Clangula hyemalis | 1 | 0 | 1 |
| Red-breasted Merganser Mergus serrator | Scaly-sided Merganser Mergus squamatus | 1 | 0 | 1 |
| Little Grebe Tachybaptus ruficollis | Red-necked Grebe Podiceps grisegena | 1 | 0 | 1 |
| Japanese Woodpigeon Columba janthina | Asian Emerald Dove Chalcophaps indica | 1 | 1 | 0 |
| Rufous Turtle Dove Streptopelia orientalis | Collared Dove Streptopelia decaocto | 1 | 0 | 1 |
| Rufous Turtle Dove Streptopelia orientalis | Red Collared Dove Streptopelia tranquebarica | 1 | 1 | 0 |
| Rufous Turtle Dove Streptopelia orientalis | White-bellied Green-Pigeon Treron sieboldii | 1 | 1 | 0 |
| Collared Dove Streptopelia decaocto | Red Collared Dove Streptopelia tranquebarica | 1 | 0 | 1 |
| Asian Emerald Dove Chalcophaps indica | White-bellied Green-Pigeon Treron sieboldii | 1 | 0 | 1 |
| Asian Emerald Dove Chalcophaps indica | Masked Bunting Emberiza personata | 1 | 1 | 0 |
| Chestnut-winged Cuckoo Clamator coromandus | Asian Koel Eudynamys scolopaceus | 1 | 1 | 0 |
| Northern Hawk-Cuckoo Hierococcyx hyperythrus | Indian Cuckoo Cuculus micropterus | 1 | 0 | 1 |
| Indian Cuckoo Cuculus micropterus | Common Cuckoo Cuculus canorus | 1 | 1 | 0 |
| Himalayan Swiftlet Aerodramus brevirostris | House Swift Apus nipalensis | 1 | 1 | 0 |
| Common Moorhen Gallinula chloropus | Watercock Gallicrex cinerea | 1 | 1 | 0 |
| Watercock Gallicrex cinerea | White-breasted Waterhen Amaurornis phoenicurus | 1 | 0 | 1 |
| Watercock Gallicrex cinerea | Ruddy-breasted Crake Zapornia fusca | 1 | 1 | 0 |
| White-breasted Waterhen Amaurornis phoenicurus | Slaty-legged Crake Rallina eurizonoides | 1 | 0 | 1 |
| Ruddy-breasted Crake Zapornia fusca | Baillon's Crake Zapornia pusilla | 1 | 0 | 1 |
| Siberian Crane Leucogeranus leucogeranus | Sandhill Crane Antigone canadensis | 1 | 0 | 1 |
| Siberian Crane Leucogeranus leucogeranus | Common Crane Grus grus | 1 | 1 | 0 |
| Black-winged Stilt Himantopus himantopus | Grey Plover Pluvialis squatarola | 1 | 0 | 1 |
| Grey Plover Pluvialis squatarola | Pacific Golden Plover Pluvialis fulva | 1 | 1 | 0 |
| European Golden Plover Pluvialis apricaria | Pacific Golden Plover Pluvialis fulva | 1 | 1 | 0 |
| American Golden Plover Pluvialis dominica | Pacific Golden Plover Pluvialis fulva | 1 | 1 | 0 |
| Common Ringed Plover Charadrius hiaticula | Semipalmated Plover Charadrius semipalmatus | 1 | 1 | 0 |
| Common Ringed Plover Charadrius hiaticula | Long-billed Plover Thinornis placidus | 1 | 0 | 1 |
| Long-billed Plover Thinornis placidus | Siberian Sand Plover Anarhynchus mongolus | 1 | 1 | 0 |
| Northern Lapwing Vanellus vanellus | Grey-headed Lapwing Vanellus cinereus | 1 | 0 | 1 |
| Oriental Plover Anarhynchus veredus | Siberian Sand Plover Anarhynchus mongolus | 1 | 0 | 1 |
| Siberian Sand Plover Anarhynchus mongolus | Greater Painted-Snipe Rostratula benghalensis | 1 | 1 | 0 |
| Kentish Plover Anarhynchus alexandrinus | Pheasant-tailed Jacana Hydrophasianus chirurgus | 1 | 0 | 1 |
| Greater Painted-Snipe Rostratula benghalensis | Pheasant-tailed Jacana Hydrophasianus chirurgus | 1 | 1 | 0 |
| Bristle-thighed Curlew Numenius tahitiensis | Far Eastern Curlew Numenius madagascariensis | 1 | 1 | 0 |
| Bristle-thighed Curlew Numenius tahitiensis | Eurasian Curlew Numenius arquata | 1 | 0 | 1 |
| Bar-tailed Godwit Limosa lapponica | Short-billed Dowitcher Limnodromus griseus | 1 | 1 | 0 |
| Short-billed Dowitcher Limnodromus griseus | Long-billed Dowitcher Limnodromus scolopaceus | 1 | 1 | 0 |
| Amami Woodcock Scolopax mira | Pin-tailed Snipe Gallinago stenura | 1 | 1 | 0 |
| Solitary Snipe Gallinago solitaria | Common Snipe Gallinago gallinago | 1 | 1 | 0 |
| Green Sandpiper Tringa ochropus | Grey-tailed Tattler Tringa brevipes | 1 | 0 | 1 |
| Marsh Sandpiper Tringa stagnatilis | Wood Sandpiper Tringa glareola | 1 | 0 | 1 |
| Marsh Sandpiper Tringa stagnatilis | Common Redshank Tringa totanus | 1 | 1 | 0 |
| Common Redshank Tringa totanus | Common Greenshank Tringa nebularia | 1 | 0 | 1 |
| Nordmann's Greenshank Tringa guttifer | Common Greenshank Tringa nebularia | 1 | 0 | 1 |
| Common Greenshank Tringa nebularia | Greater Yellowlegs Tringa melanoleuca | 1 | 0 | 1 |
| Common Greenshank Tringa nebularia | Eurasian Wryneck Jynx torquilla | 1 | 1 | 0 |
| Great Knot Calidris tenuirostris | Broad-billed Sandpiper Calidris falcinellus | 1 | 1 | 0 |
| Broad-billed Sandpiper Calidris falcinellus | Rock Sandpiper Calidris ptilocnemis | 1 | 0 | 1 |
| Sharp-tailed Sandpiper Calidris acuminata | Curlew Sandpiper Calidris ferruginea | 1 | 0 | 1 |
| Sharp-tailed Sandpiper Calidris acuminata | Pectoral Sandpiper Calidris melanotos | 1 | 1 | 0 |
| Long-toed Stint Calidris subminuta | Red-necked Stint Calidris ruficollis | 1 | 1 | 0 |
| Spoon-billed Sandpiper Calidris pygmaea | Western Sandpiper Calidris mauri | 1 | 0 | 1 |
| Dunlin Calidris alpina | Rock Sandpiper Calidris ptilocnemis | 1 | 0 | 1 |
| Baird's Sandpiper Calidris bairdii | Western Sandpiper Calidris mauri | 1 | 0 | 1 |
| White-rumped Sandpiper Calidris fuscicollis | Western Sandpiper Calidris mauri | 1 | 1 | 0 |
| Rhinoceros Auklet Cerorhinca monocerata | Least Auklet Aethia pusilla | 1 | 0 | 1 |
| Rhinoceros Auklet Cerorhinca monocerata | Short-tailed Shearwater Ardenna tenuirostris | 1 | 1 | 0 |
| Rhinoceros Auklet Cerorhinca monocerata | Japanese Pygmy Woodpecker Yungipicus kizuki | 1 | 1 | 0 |
| Crested Auklet Aethia cristatella | Parakeet Auklet Aethia psittacula | 1 | 0 | 1 |
| Crested Auklet Aethia cristatella | Spectacled Guillemot Cepphus carbo | 1 | 1 | 0 |
| Crested Auklet Aethia cristatella | Japanese Murrelet Synthliboramphus wumizusume | 1 | 0 | 1 |
| Long-billed Murrelet Brachyramphus perdix | Spectacled Guillemot Cepphus carbo | 1 | 1 | 0 |
| Spectacled Guillemot Cepphus carbo | Brünnich's Guillemot Uria lomvia | 1 | 0 | 1 |
| Brünnich's Guillemot Uria lomvia | Japanese Murrelet Synthliboramphus wumizusume | 1 | 1 | 0 |
| Black-legged Kittiwake Rissa tridactyla | Black-headed Gull Chroicocephalus ridibundus | 1 | 0 | 1 |
| Black-legged Kittiwake Rissa tridactyla | Great Cormorant Phalacrocorax carbo | 1 | 0 | 1 |
| Saunders's Gull Saundersilarus saundersi | Herring Gull Larus argentatus | 1 | 0 | 1 |
| Black-headed Gull Chroicocephalus ridibundus | Brown-headed Gull Chroicocephalus brunnicephalus | 1 | 0 | 1 |
| Laughing Gull Leucophaeus atricilla | Pallas's Gull Ichthyaetus ichthyaetus | 1 | 1 | 0 |
| Pallas's Gull Ichthyaetus ichthyaetus | Common Gull Larus canus | 1 | 0 | 1 |
| Black-tailed Gull Larus crassirostris | Common Gull Larus canus | 1 | 0 | 1 |
| Black-tailed Gull Larus crassirostris | Herring Gull Larus argentatus | 1 | 0 | 1 |
| Black-tailed Gull Larus crassirostris | Short-tailed Shearwater Ardenna tenuirostris | 1 | 1 | 0 |
| Common Gull Larus canus | Herring Gull Larus argentatus | 1 | 1 | 0 |
| Herring Gull Larus argentatus | Lesser Black-backed Gull Larus fuscus | 1 | 0 | 1 |
| Herring Gull Larus argentatus | Glaucous-winged Gull Larus glaucescens | 1 | 0 | 1 |
| Slaty-backed Gull Larus schistisagus | Iceland Gull Larus glaucoides | 1 | 1 | 0 |
| Slaty-backed Gull Larus schistisagus | Sooty Tern Onychoprion fuscatus | 1 | 1 | 0 |
| Brown Noddy Anous stolidus | Black Noddy Anous minutus | 1 | 0 | 1 |
| Brown Noddy Anous stolidus | Sooty Tern Onychoprion fuscatus | 1 | 0 | 1 |
| Little Tern Sternula albifrons | Least Tern Sternula antillarum | 1 | 1 | 0 |
| Whiskered Tern Chlidonias hybrida | Black-naped Tern Sterna sumatrana | 1 | 1 | 0 |
| White-winged Black Tern Chlidonias leucopterus | Common Tern Sterna hirundo | 1 | 0 | 1 |
| Arctic Tern Sterna paradisaea | Japanese Leaf Warbler Phylloscopus xanthodryas | 1 | 0 | 1 |
| Black-naped Tern Sterna sumatrana | Great Crested Tern Thalasseus bergii | 1 | 0 | 1 |
| Red-throated Diver Gavia stellata | Pacific Diver Gavia pacifica | 1 | 1 | 0 |
| Red-throated Diver Gavia stellata | White-billed Diver Gavia adamsii | 1 | 1 | 0 |
| Black-throated Diver Gavia arctica | White-billed Diver Gavia adamsii | 1 | 0 | 1 |
| Pacific Diver Gavia pacifica | Black-footed Albatross Phoebastria nigripes | 1 | 1 | 0 |
| Black-footed Albatross Phoebastria nigripes | Short-tailed Albatross Phoebastria albatrus | 1 | 0 | 1 |
| Short-tailed Albatross Phoebastria albatrus | Wilson's Storm-Petrel Oceanites oceanicus | 1 | 1 | 0 |
| Short-tailed Albatross Phoebastria albatrus | Fork-tailed Storm-Petrel Hydrobates furcatus | 1 | 0 | 1 |
| Wilson's Storm-Petrel Oceanites oceanicus | Fork-tailed Storm-Petrel Hydrobates furcatus | 1 | 1 | 0 |
| Wilson's Storm-Petrel Oceanites oceanicus | Leach's Storm-Petrel Hydrobates leucorhous | 1 | 1 | 0 |
| Fork-tailed Storm-Petrel Hydrobates furcatus | Leach's Storm-Petrel Hydrobates leucorhous | 1 | 0 | 1 |
| Fork-tailed Storm-Petrel Hydrobates furcatus | Swinhoe's Storm-Petrel Hydrobates monorhis | 1 | 1 | 0 |
| Fork-tailed Storm-Petrel Hydrobates furcatus | Tristram's Storm-Petrel Hydrobates tristrami | 1 | 0 | 1 |
| Fork-tailed Storm-Petrel Hydrobates furcatus | Tahiti Petrel Pseudobulweria rostrata | 1 | 1 | 0 |
| Leach's Storm-Petrel Hydrobates leucorhous | Swinhoe's Storm-Petrel Hydrobates monorhis | 1 | 1 | 0 |
| Tristram's Storm-Petrel Hydrobates tristrami | Kermadec Petrel Pterodroma neglecta | 1 | 0 | 1 |
| Northern Fulmar Fulmarus glacialis | Providence Petrel Pterodroma solandri | 1 | 1 | 0 |
| Kermadec Petrel Pterodroma neglecta | Providence Petrel Pterodroma solandri | 1 | 1 | 0 |
| Kermadec Petrel Pterodroma neglecta | White-necked Petrel Pterodroma cervicalis | 1 | 1 | 0 |
| Murphy's Petrel Pterodroma ultima | Flesh-footed Shearwater Ardenna carneipes | 1 | 1 | 0 |
| White-necked Petrel Pterodroma cervicalis | Stejneger's Petrel Pterodroma longirostris | 1 | 1 | 0 |
| Bonin Petrel Pterodroma hypoleuca | Stejneger's Petrel Pterodroma longirostris | 1 | 0 | 1 |
| Stejneger's Petrel Pterodroma longirostris | Tahiti Petrel Pseudobulweria rostrata | 1 | 0 | 1 |
| Bulwer's Petrel Bulweria bulwerii | Tahiti Petrel Pseudobulweria rostrata | 1 | 0 | 1 |
| Bulwer's Petrel Bulweria bulwerii | Flesh-footed Shearwater Ardenna carneipes | 1 | 1 | 0 |
| Tahiti Petrel Pseudobulweria rostrata | Flesh-footed Shearwater Ardenna carneipes | 1 | 1 | 0 |
| Streaked Shearwater Calonectris leucomelas | Flesh-footed Shearwater Ardenna carneipes | 1 | 1 | 0 |
| Streaked Shearwater Calonectris leucomelas | Tropical Shearwater Puffinus bailloni | 1 | 0 | 1 |
| Wedge-tailed Shearwater Ardenna pacifica | Buller's Shearwater Ardenna bulleri | 1 | 0 | 1 |
| Sooty Shearwater Ardenna grisea | Bryan's Shearwater Puffinus bryani | 1 | 1 | 0 |
| Manx Shearwater Puffinus puffinus | Newell's Shearwater Puffinus newelli | 1 | 0 | 1 |
| Bannerman's Shearwater Puffinus bannermani | Bryan's Shearwater Puffinus bryani | 1 | 0 | 1 |
| Masked Booby Sula dactylatra | Red-faced Cormorant Urile urile | 1 | 0 | 1 |
| Red-faced Cormorant Urile urile | Japanese Cormorant Phalacrocorax capillatus | 1 | 1 | 0 |
| Pelagic Cormorant Urile pelagicus | Japanese Cormorant Phalacrocorax capillatus | 1 | 1 | 0 |
| Great Cormorant Phalacrocorax carbo | Eurasian Jay Garrulus glandarius | 1 | 1 | 0 |
| Japanese Cormorant Phalacrocorax capillatus | Schrenck's Bittern Botaurus eurhythmus | 1 | 1 | 0 |
| Eurasian Bittern Botaurus stellaris | Yellow Bittern Botaurus sinensis | 1 | 1 | 0 |
| Black Bittern Botaurus flavicollis | Cinnamon Bittern Botaurus cinnamomeus | 1 | 1 | 0 |
| Schrenck's Bittern Botaurus eurhythmus | Yellow Bittern Botaurus sinensis | 1 | 0 | 1 |
| Malayan Night Heron Gorsachius melanolophus | Japanese Night Heron Gorsachius goisagi | 1 | 0 | 1 |
| Malayan Night Heron Gorsachius melanolophus | Yellow-breasted Bunting Emberiza aureola | 1 | 1 | 0 |
| Japanese Night Heron Gorsachius goisagi | Chinese Pond Heron Ardeola bacchus | 1 | 1 | 0 |
| Pacific Reef-Heron Egretta sacra | Little Egret Egretta garzetta | 1 | 0 | 1 |
| Pacific Reef-Heron Egretta sacra | Striated Heron Butorides striata | 1 | 1 | 0 |
| Chinese Egret Egretta eulophotes | Little Egret Egretta garzetta | 1 | 0 | 1 |
| Chinese Egret Egretta eulophotes | Chinese Pond Heron Ardeola bacchus | 1 | 1 | 0 |
| Striated Heron Butorides striata | Chinese Pond Heron Ardeola bacchus | 1 | 1 | 0 |
| Indian Pond Heron Ardeola grayii | Chinese Pond Heron Ardeola bacchus | 1 | 1 | 0 |
| Chinese Pond Heron Ardeola bacchus | Eastern Cattle-Egret Ardea coromanda | 1 | 1 | 0 |
| Chinese Pond Heron Ardeola bacchus | Crested Ibis Nipponia nippon | 1 | 0 | 1 |
| Great White Egret Ardea alba | Grey Heron Ardea cinerea | 1 | 1 | 0 |
| Purple Heron Ardea purpurea | Eurasian Spoonbill Platalea leucorodia | 1 | 0 | 1 |
| Eurasian Spoonbill Platalea leucorodia | Black-faced Spoonbill Platalea minor | 1 | 1 | 0 |
| Mountain Hawk-Eagle Nisaetus nipalensis | Eastern Marsh Harrier Circus spilonotus | 1 | 0 | 1 |
| Greater Spotted Eagle Clanga clanga | Imperial Eagle Aquila heliaca | 1 | 0 | 1 |
| Grey-faced Buzzard Butastur indicus | Eastern Marsh Harrier Circus spilonotus | 1 | 0 | 1 |
| Grey-faced Buzzard Butastur indicus | Chinese Sparrowhawk Tachyspiza soloensis | 1 | 0 | 1 |
| Eastern Marsh Harrier Circus spilonotus | Pallid Harrier Circus macrourus | 1 | 1 | 0 |
| Eastern Marsh Harrier Circus spilonotus | Chinese Sparrowhawk Tachyspiza soloensis | 1 | 1 | 0 |
| Eastern Marsh Harrier Circus spilonotus | Japanese Sparrowhawk Tachyspiza gularis | 1 | 1 | 0 |
| Hen Harrier Circus cyaneus | Northern Harrier Circus hudsonius | 1 | 0 | 1 |
| Pallid Harrier Circus macrourus | Pied Harrier Circus melanoleucos | 1 | 0 | 1 |
| Japanese Sparrowhawk Tachyspiza gularis | Eurasian Sparrowhawk Accipiter nisus | 1 | 1 | 0 |
| Japanese Sparrowhawk Tachyspiza gularis | Black Kite Milvus migrans | 1 | 1 | 0 |
| White-tailed Eagle Haliaeetus albicilla | Rough-legged Buzzard Buteo lagopus | 1 | 0 | 1 |
| Rough-legged Buzzard Buteo lagopus | Upland Buzzard Buteo hemilasius | 1 | 1 | 0 |
| Eastern Buzzard Buteo japonicus | Upland Buzzard Buteo hemilasius | 1 | 0 | 1 |
| Ryukyu Scops Owl Otus elegans | Ural Owl Strix uralensis | 1 | 0 | 1 |
| Ryukyu Scops Owl Otus elegans | Northern Boobook Ninox japonica | 1 | 1 | 0 |
| Ural Owl Strix uralensis | Northern Boobook Ninox japonica | 1 | 1 | 0 |
| Northern Boobook Ninox japonica | Common Hoopoe Upupa epops | 1 | 0 | 1 |
| Crested Kingfisher Megaceryle lugubris | Dollarbird Eurystomus orientalis | 1 | 1 | 0 |
| Eurasian Three-toed Woodpecker Picoides tridactylus | Japanese Pygmy Woodpecker Yungipicus kizuki | 1 | 1 | 0 |
| Japanese Pygmy Woodpecker Yungipicus kizuki | Great Spotted Woodpecker Dendrocopos major | 1 | 0 | 1 |
| White-backed Woodpecker Dendrocopos leucotos | Lesser Spotted Woodpecker Dryobates minor | 1 | 1 | 0 |
| Great Spotted Woodpecker Dendrocopos major | Japanese Woodpecker Picus awokera | 1 | 0 | 1 |
| Amur Falcon Falco amurensis | Eurasian Hobby Falco subbuteo | 1 | 1 | 0 |
| Amur Falcon Falco amurensis | Peregrine Falcon Falco peregrinus | 1 | 0 | 1 |
| Eurasian Hobby Falco subbuteo | Peregrine Falcon Falco peregrinus | 1 | 1 | 0 |
| Gyr Falcon Falco rusticolus | Peregrine Falcon Falco peregrinus | 1 | 0 | 1 |
| Ashy Minivet Pericrocotus divaricatus | Chestnut-cheeked Starling Agropsar philippensis | 1 | 0 | 1 |
| Black Drongo Dicrurus macrocercus | Ashy Drongo Dicrurus leucophaeus | 1 | 1 | 0 |
| Black Drongo Dicrurus macrocercus | Hair-crested Drongo Dicrurus hottentottus | 1 | 0 | 1 |
| Black Drongo Dicrurus macrocercus | Asian Glossy Starling Aplonis panayensis | 1 | 0 | 1 |
| Ashy Drongo Dicrurus leucophaeus | Hair-crested Drongo Dicrurus hottentottus | 1 | 0 | 1 |
| Hair-crested Drongo Dicrurus hottentottus | Black Paradise-Flycatcher Terpsiphone atrocaudata | 1 | 1 | 0 |
| Tiger Shrike Lanius tigrinus | Red-backed Shrike Lanius collurio | 1 | 1 | 0 |
| Long-tailed Shrike Lanius schach | Chinese Grey Shrike Lanius sphenocercus | 1 | 0 | 1 |
| Lidth's Jay Garrulus lidthi | Azure-winged Magpie Cyanopica cyanus | 1 | 0 | 1 |
| Daurian Jackdaw Coloeus dauuricus | Carrion Crow Corvus corone | 1 | 1 | 0 |
| Daurian Jackdaw Coloeus dauuricus | Large-billed Crow Corvus macrorhynchos | 1 | 1 | 0 |
| Large-billed Crow Corvus macrorhynchos | Eurasian Tree Sparrow Passer montanus | 1 | 1 | 0 |
| Coal Tit Periparus ater | Willow Tit Poecile montanus | 1 | 1 | 0 |
| Coal Tit Periparus ater | Brambling Fringilla montifringilla | 1 | 0 | 1 |
| Greylag Goose Anser anser | Swan Goose Anser cygnoides | 1 | 0 | 1 |
| Owston's Tit Sittiparus owstoni | Japanese Tit Parus minor | 1 | 1 | 0 |
| Marsh Tit Poecile palustris | Brambling Fringilla montifringilla | 1 | 1 | 0 |
| Willow Tit Poecile montanus | Japanese Tit Parus minor | 1 | 1 | 0 |
| Japanese Tit Parus minor | Oriental Greenfinch Chloris sinica | 1 | 1 | 0 |
| Shore Lark Eremophila alpestris | Mongolian Short-toed Lark Calandrella dukhunensis | 1 | 0 | 1 |
| Mongolian Short-toed Lark Calandrella dukhunensis | Asian Short-toed Lark Alaudala cheleensis | 1 | 1 | 0 |
| Mongolian Short-toed Lark Calandrella dukhunensis | Eurasian Skylark Alauda arvensis | 1 | 1 | 0 |
| Bimaculated Lark Melanocorypha bimaculata | Mongolian Lark Melanocorypha mongolica | 1 | 1 | 0 |
| Mongolian Lark Melanocorypha mongolica | Asian Short-toed Lark Alaudala cheleensis | 1 | 0 | 1 |
| Mongolian Lark Melanocorypha mongolica | Eurasian Skylark Alauda arvensis | 1 | 0 | 1 |
| Plain Prinia Prinia inornata | Booted Warbler Iduna caligata | 1 | 0 | 1 |
| Plain Prinia Prinia inornata | Oriental Reed Warbler Acrocephalus orientalis | 1 | 1 | 0 |
| Zitting Cisticola Cisticola juncidis | Sedge Warbler Acrocephalus schoenobaenus | 1 | 0 | 1 |
| Booted Warbler Iduna caligata | Manchurian Reed Warbler Acrocephalus tangorum | 1 | 1 | 0 |
| Booted Warbler Iduna caligata | Blyth's Reed Warbler Acrocephalus dumetorum | 1 | 1 | 0 |
| Oriental Reed Warbler Acrocephalus orientalis | Sakhalin Grasshopper Warbler Helopsaltes amnicola | 1 | 1 | 0 |
| Sakhalin Grasshopper Warbler Helopsaltes amnicola | Marsh Grassbird Helopsaltes pryeri | 1 | 1 | 0 |
| Sakhalin Grasshopper Warbler Helopsaltes amnicola | Middendorff's Grasshopper Warbler Helopsaltes ochotensis | 1 | 0 | 1 |
| Marsh Grassbird Helopsaltes pryeri | Pleske's Grasshopper Warbler Helopsaltes pleskei | 1 | 1 | 0 |
| Pallas's Grasshopper Warbler Helopsaltes certhiola | Pleske's Grasshopper Warbler Helopsaltes pleskei | 1 | 1 | 0 |
| Lanceolated Warbler Locustella lanceolata | Blyth's Pipit Anthus godlewskii | 1 | 1 | 0 |
| Sand Martin Riparia riparia | Pacific Swallow Hirundo javanica | 1 | 0 | 1 |
| Pacific Swallow Hirundo javanica | Asian House Martin Delichon dasypus | 1 | 0 | 1 |
| Siberian House Martin Delichon lagopodum | Asian House Martin Delichon dasypus | 1 | 1 | 0 |
| Chinese Leaf Warbler Phylloscopus yunnanensis | Radde's Warbler Phylloscopus schwarzi | 1 | 1 | 0 |