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 |
|---|---|---|---|---|
| Common Swift Apus apus | Pallid Swift Apus pallidus | 2 | 2 | 0 |
| Sand Martin Riparia riparia | Eurasian Crag Martin Ptyonoprogne rupestris | 2 | 0 | 2 |
| Redwing Turdus iliacus | Fieldfare Turdus pilaris | 2 | 1 | 1 |
| Western Bonelli's Warbler Phylloscopus bonelli | Common Chiffchaff Phylloscopus collybita | 2 | 2 | 0 |
| Booted Eagle Hieraaetus pennatus | Bonelli's Eagle Aquila fasciata | 2 | 1 | 1 |
| Willow Warbler Phylloscopus trochilus | Common Chiffchaff Phylloscopus collybita | 2 | 1 | 1 |
| Tree Pipit Anthus trivialis | Water Pipit Anthus spinoletta | 2 | 2 | 0 |
| Whimbrel Numenius phaeopus | Eurasian Curlew Numenius arquata | 2 | 1 | 1 |
| Western Marsh Harrier Circus aeruginosus | Montagu's Harrier Circus pygargus | 2 | 1 | 1 |
| Hen Harrier Circus cyaneus | Montagu's Harrier Circus pygargus | 2 | 1 | 1 |
| Goosander Mergus merganser | Red-breasted Merganser Mergus serrator | 2 | 0 | 2 |
| Greater Short-toed Lark Calandrella brachydactyla | Woodlark Lullula arborea | 2 | 0 | 2 |
| Black Tern Chlidonias niger | Common Tern Sterna hirundo | 1 | 0 | 1 |
| Common Tern Sterna hirundo | Sandwich Tern Thalasseus sandvicensis | 1 | 1 | 0 |
| Black-throated Diver Gavia arctica | Yelkouan Shearwater Puffinus yelkouan | 1 | 0 | 1 |
| Great Northern Diver Gavia immer | Cory's Shearwater Calonectris diomedea | 1 | 1 | 0 |
| Short-toed Eagle Circaetus gallicus | Booted Eagle Hieraaetus pennatus | 1 | 0 | 1 |
| Short-toed Eagle Circaetus gallicus | Golden Eagle Aquila chrysaetos | 1 | 0 | 1 |
| Greater Spotted Eagle Clanga clanga | Golden Eagle Aquila chrysaetos | 1 | 1 | 0 |
| Bonelli's Eagle Aquila fasciata | Western Marsh Harrier Circus aeruginosus | 1 | 1 | 0 |
| Hen Harrier Circus cyaneus | Levant Sparrowhawk Tachyspiza brevipes | 1 | 0 | 1 |
| Levant Sparrowhawk Tachyspiza brevipes | Eurasian Sparrowhawk Accipiter nisus | 1 | 1 | 0 |
| Eurasian Sparrowhawk Accipiter nisus | Eurasian Goshawk Astur gentilis | 1 | 1 | 0 |
| American Barn Owl Tyto furcata | Eurasian Eagle Owl Bubo bubo | 1 | 1 | 0 |
| Little Owl Athene noctua | Ural Owl Strix uralensis | 1 | 1 | 0 |
| Tawny Owl Strix aluco | Ural Owl Strix uralensis | 1 | 1 | 0 |
| Tawny Owl Strix aluco | Tengmalm's Owl Aegolius funereus | 1 | 1 | 0 |
| Middle Spotted Woodpecker Dendrocoptes medius | Great Spotted Woodpecker Dendrocopos major | 1 | 0 | 1 |
| Grey-headed Woodpecker Picus canus | Eurasian Green Woodpecker Picus viridis | 1 | 1 | 0 |
| Common Kestrel Falco tinnunculus | Lanner Falcon Falco biarmicus | 1 | 0 | 1 |
| Red-footed Falcon Falco vespertinus | Eleonora's Falcon Falco eleonorae | 1 | 0 | 1 |
| Red-footed Falcon Falco vespertinus | Lanner Falcon Falco biarmicus | 1 | 0 | 1 |
| Eleonora's Falcon Falco eleonorae | Eurasian Hobby Falco subbuteo | 1 | 1 | 0 |
| Eleonora's Falcon Falco eleonorae | Saker Falcon Falco cherrug | 1 | 1 | 0 |
| Eurasian Hobby Falco subbuteo | Saker Falcon Falco cherrug | 1 | 0 | 1 |
| Eurasian Golden Oriole Oriolus oriolus | Red-backed Shrike Lanius collurio | 1 | 0 | 1 |
| Eurasian Golden Oriole Oriolus oriolus | Lesser Grey Shrike Lanius minor | 1 | 1 | 0 |
| Coal Tit Periparus ater | Sombre Tit Poecile lugubris | 1 | 0 | 1 |
| Coal Tit Periparus ater | Great Tit Parus major | 1 | 1 | 0 |
| Greater Short-toed Lark Calandrella brachydactyla | Eurasian Skylark Alauda arvensis | 1 | 1 | 0 |
| Woodlark Lullula arborea | Eurasian Skylark Alauda arvensis | 1 | 0 | 1 |
| Eastern Olivaceous Warbler Iduna pallida | Olive-tree Warbler Hippolais olivetorum | 1 | 1 | 0 |
| Olive-tree Warbler Hippolais olivetorum | Marsh Warbler Acrocephalus palustris | 1 | 1 | 0 |
| Olive-tree Warbler Hippolais olivetorum | Great Reed Warbler Acrocephalus arundinaceus | 1 | 0 | 1 |
| Moustached Warbler Acrocephalus melanopogon | Sedge Warbler Acrocephalus schoenobaenus | 1 | 0 | 1 |
| Common Reed Warbler Acrocephalus scirpaceus | Great Reed Warbler Acrocephalus arundinaceus | 1 | 1 | 0 |
| Great Reed Warbler Acrocephalus arundinaceus | Savi's Warbler Locustella luscinioides | 1 | 1 | 0 |
| Eastern Bonelli's Warbler Phylloscopus orientalis | Common Chiffchaff Phylloscopus collybita | 1 | 0 | 1 |
| Eastern Orphean Warbler Curruca crassirostris | Sardinian Warbler Curruca melanocephala | 1 | 0 | 1 |
| Eastern Orphean Warbler Curruca crassirostris | Eastern Subalpine Warbler Curruca cantillans | 1 | 0 | 1 |
| Sardinian Warbler Curruca melanocephala | Eastern Subalpine Warbler Curruca cantillans | 1 | 1 | 0 |
| Eastern Subalpine Warbler Curruca cantillans | Common Whitethroat Curruca communis | 1 | 0 | 1 |
| Goldcrest Regulus regulus | Common Firecrest Regulus ignicapilla | 1 | 0 | 1 |
| Common Starling Sturnus vulgaris | European Goldfinch Carduelis carduelis | 1 | 0 | 1 |
| Mistle Thrush Turdus viscivorus | Song Thrush Turdus philomelos | 1 | 1 | 0 |
| Thrush Nightingale Luscinia luscinia | European Pied Flycatcher Ficedula hypoleuca | 1 | 0 | 1 |
| Spanish Sparrow Passer hispaniolensis | Eurasian Tree Sparrow Passer montanus | 1 | 1 | 0 |
| Meadow Pipit Anthus pratensis | Red-throated Pipit Anthus cervinus | 1 | 0 | 1 |
| Common Linnet Linaria cannabina | Common Redpoll Acanthis flammea | 1 | 0 | 1 |
| Common Redpoll Acanthis flammea | European Serin Serinus serinus | 1 | 1 | 0 |
| European Serin Serinus serinus | Eurasian Siskin Spinus spinus | 1 | 0 | 1 |
| Cirl Bunting Emberiza cirlus | Ortolan Bunting Emberiza hortulana | 1 | 1 | 0 |
| Greylag Goose Anser anser | Tundra Bean Goose Anser serrirostris | 1 | 0 | 1 |
| Yellowhammer Emberiza citrinella | Common Reed Bunting Emberiza schoeniclus | 1 | 1 | 0 |
| Bewick's Swan Cygnus columbianus | Whooper Swan Cygnus cygnus | 1 | 0 | 1 |
| Bar-tailed Godwit Limosa lapponica | Black-tailed Godwit Limosa limosa | 1 | 0 | 1 |
| Great Snipe Gallinago media | Common Snipe Gallinago gallinago | 1 | 1 | 0 |
| Common Sandpiper Actitis hypoleucos | Wood Sandpiper Tringa glareola | 1 | 1 | 0 |
| Green Sandpiper Tringa ochropus | Wood Sandpiper Tringa glareola | 1 | 1 | 0 |
| Sanderling Calidris alba | Dunlin Calidris alpina | 1 | 1 | 0 |
| Black-headed Gull Chroicocephalus ridibundus | Audouin's Gull Ichthyaetus audouinii | 1 | 0 | 1 |
| Caspian Gull Larus cachinnans | Yellow-legged Gull Larus michahellis | 1 | 1 | 0 |
| Gull-billed Tern Gelochelidon nilotica | Caspian Tern Hydroprogne caspia | 1 | 0 | 1 |
| Whiskered Tern Chlidonias hybrida | Common Tern Sterna hirundo | 1 | 1 | 0 |
| Whiskered Tern Chlidonias hybrida | Sandwich Tern Thalasseus sandvicensis | 1 | 0 | 1 |