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 |
|---|---|---|---|---|
| Emperor Goose Anser canagicus | Greylag Goose Anser anser | 1 | 1 | 0 |
| Steller's Eider Polysticta stelleri | Common Reed Warbler Acrocephalus scirpaceus | 1 | 1 | 0 |
| King Eider Somateria spectabilis | Harlequin Duck Histrionicus histrionicus | 1 | 0 | 1 |
| Willow Ptarmigan Lagopus lagopus | Rock Ptarmigan Lagopus muta | 1 | 0 | 1 |
| Willow Ptarmigan Lagopus lagopus | Caucasian Grouse Lyrurus mlokosiewiczi | 1 | 0 | 1 |
| Red-necked Grebe Podiceps grisegena | Black-necked Grebe Podiceps nigricollis | 1 | 0 | 1 |
| Water Rail Rallus aquaticus | Brown-cheeked Rail Rallus indicus | 1 | 0 | 1 |
| Ruddy-breasted Crake Zapornia fusca | Band-bellied Crake Zapornia paykullii | 1 | 0 | 1 |
| American Golden Plover Pluvialis dominica | Pacific Golden Plover Pluvialis fulva | 1 | 1 | 0 |
| Northern Lapwing Vanellus vanellus | Rough-legged Buzzard Buteo lagopus | 1 | 1 | 0 |
| Common Redshank Tringa totanus | Common Greenshank Tringa nebularia | 1 | 1 | 0 |
| Great Knot Calidris tenuirostris | Red Knot Calidris canutus | 1 | 0 | 1 |
| South Polar Skua Stercorarius maccormicki | Horned Puffin Fratercula corniculata | 1 | 1 | 0 |
| Whiskered Auklet Aethia pygmaea | Parakeet Auklet Aethia psittacula | 1 | 1 | 0 |
| Sabine's Gull Xema sabini | Saunders's Gull Saundersilarus saundersi | 1 | 0 | 1 |
| Saunders's Gull Saundersilarus saundersi | Bonaparte's Gull Chroicocephalus philadelphia | 1 | 0 | 1 |
| Lesser Black-backed Gull Larus fuscus | Slaty-backed Gull Larus schistisagus | 1 | 1 | 0 |
| Gull-billed Tern Gelochelidon nilotica | Whiskered Tern Chlidonias hybrida | 1 | 1 | 0 |
| Black Tern Chlidonias niger | Arctic Tern Sterna paradisaea | 1 | 1 | 0 |
| Black-footed Albatross Phoebastria nigripes | Short-tailed Albatross Phoebastria albatrus | 1 | 0 | 1 |
| Mottled Petrel Pterodroma inexpectata | Flesh-footed Shearwater Ardenna carneipes | 1 | 1 | 0 |
| Great Frigatebird Fregata minor | Brown Booby Sula leucogaster | 1 | 0 | 1 |
| Great Cormorant Phalacrocorax carbo | Great White Pelican Pelecanus onocrotalus | 1 | 0 | 1 |
| Little Egret Egretta garzetta | Great White Egret Ardea alba | 1 | 1 | 0 |
| European Honey-buzzard Pernis apivorus | Crested Honey-buzzard Pernis ptilorhynchus | 1 | 1 | 0 |
| Eurasian Goshawk Astur gentilis | Steller's Sea-Eagle Haliaeetus pelagicus | 1 | 1 | 0 |
| Steller's Sea-Eagle Haliaeetus pelagicus | White-tailed Eagle Haliaeetus albicilla | 1 | 1 | 0 |
| Grey-capped Pygmy Woodpecker Yungipicus canicapillus | Japanese Pygmy Woodpecker Yungipicus kizuki | 1 | 0 | 1 |
| Rufous-bellied Woodpecker Dendrocopos hyperythrus | Great Spotted Woodpecker Dendrocopos major | 1 | 0 | 1 |
| Saker Falcon Falco cherrug | Gyr Falcon Falco rusticolus | 1 | 1 | 0 |
| Ashy Drongo Dicrurus leucophaeus | Bull-headed Shrike Lanius bucephalus | 1 | 1 | 0 |
| Bull-headed Shrike Lanius bucephalus | Red-backed Shrike Lanius collurio | 1 | 0 | 1 |
| Great Grey Shrike Lanius excubitor | Chinese Grey Shrike Lanius sphenocercus | 1 | 0 | 1 |
| Eurasian Oystercatcher Haematopus ostralegus | Common Magpie Pica pica | 1 | 0 | 1 |
| Daurian Jackdaw Coloeus dauuricus | Hooded Crow Corvus cornix | 1 | 1 | 0 |
| Varied Tit Sittiparus varius | Willow Tit Poecile montanus | 1 | 0 | 1 |
| Marsh Warbler Acrocephalus palustris | Common Reed Warbler Acrocephalus scirpaceus | 1 | 0 | 1 |
| Common Reed Warbler Acrocephalus scirpaceus | Great Reed Warbler Acrocephalus arundinaceus | 1 | 0 | 1 |
| Sand Martin Riparia riparia | Pale Martin Riparia diluta | 1 | 0 | 1 |
| Greenish Warbler Phylloscopus trochiloides | Sakhalin Leaf Warbler Phylloscopus borealoides | 1 | 1 | 0 |
| Sakhalin Leaf Warbler Phylloscopus borealoides | Asian Stubtail Urosphena squameiceps | 1 | 1 | 0 |
| Snowy-browed Nuthatch Sitta villosa | Siberian Nuthatch Sitta arctica | 1 | 1 | 0 |
| Rose-coloured Starling Pastor roseus | White-cheeked Starling Spodiopsar cineraceus | 1 | 1 | 0 |
| White's Thrush Zoothera aurea | Mistle Thrush Turdus viscivorus | 1 | 0 | 1 |
| Grey-backed Thrush Turdus hortulorum | Eyebrowed Thrush Turdus obscurus | 1 | 0 | 1 |
| Red-throated Thrush Turdus ruficollis | Naumann's Thrush Turdus naumanni | 1 | 1 | 0 |
| Dark-sided Flycatcher Muscicapa sibirica | Spotted Flycatcher Muscicapa striata | 1 | 0 | 1 |
| Willow Tit Poecile montanus | Rufous-tailed Scrub Robin Cercotrichas galactotes | 1 | 0 | 1 |
| Siberian Rubythroat Calliope calliope | Yellow-rumped Flycatcher Ficedula zanthopygia | 1 | 0 | 1 |
| Pacific Wren Troglodytes pacificus | White-throated Rock Thrush Monticola gularis | 1 | 0 | 1 |
| European Stonechat Saxicola rubicola | Northern Wheatear Oenanthe oenanthe | 1 | 1 | 0 |
| Siberian Stonechat Saxicola maurus | Amur Stonechat Saxicola stejnegeri | 1 | 1 | 0 |
| Eastern Black-eared Wheatear Oenanthe melanoleuca | Black-faced Bunting Emberiza spodocephala | 1 | 1 | 0 |
| Altai Accentor Prunella himalayana | Siberian Accentor Prunella montanella | 1 | 0 | 1 |
| Rock Sparrow Petronia petronia | White-winged Snowfinch Montifringilla nivalis | 1 | 0 | 1 |
| Grey-crowned Rosy-Finch Leucosticte tephrocotis | Common Linnet Linaria cannabina | 1 | 1 | 0 |
| Twite Linaria flavirostris | Common Redpoll Acanthis flammea | 1 | 1 | 0 |
| Godlewski's Bunting Emberiza godlewskii | Meadow Bunting Emberiza cioides | 1 | 0 | 1 |
| Rustic Bunting Emberiza rustica | Black-faced Bunting Emberiza spodocephala | 1 | 1 | 0 |