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 Scoter Melanitta nigra | Goosander Mergus merganser | 2 | 1 | 1 |
| Black-crowned Night Heron Nycticorax nycticorax | Western Reef-Heron Egretta gularis | 2 | 2 | 0 |
| Aquatic Warbler Acrocephalus paludicola | Marsh Warbler Acrocephalus palustris | 2 | 2 | 0 |
| Corsican Finch Carduelis corsicana | Eurasian Siskin Spinus spinus | 2 | 2 | 0 |
| Red-breasted Goose Branta ruficollis | Whooper Swan Cygnus cygnus | 1 | 0 | 1 |
| Eurasian/Green-winged Teal Anas crecca | Cirl Bunting Emberiza cirlus | 1 | 1 | 0 |
| Common Eider Somateria mollissima | Goosander Mergus merganser | 1 | 0 | 1 |
| Common Scoter Melanitta nigra | White-headed Duck Oxyura leucocephala | 1 | 0 | 1 |
| Rock Partridge Alectoris graeca | Great Crested Grebe Podiceps cristatus | 1 | 0 | 1 |
| Rock Dove Columba livia | Stock Dove Columba oenas | 1 | 1 | 0 |
| Common Swift Apus apus | Pallid Swift Apus pallidus | 1 | 0 | 1 |
| Black-winged Stilt Himantopus himantopus | Pied Avocet Recurvirostra avosetta | 1 | 1 | 0 |
| Pied Avocet Recurvirostra avosetta | Common Ringed Plover Charadrius hiaticula | 1 | 0 | 1 |
| Northern Lapwing Vanellus vanellus | European Robin Erithacus rubecula | 1 | 1 | 0 |
| Bar-tailed Godwit Limosa lapponica | Black-tailed Godwit Limosa limosa | 1 | 1 | 0 |
| Jack Snipe Lymnocryptes minimus | Common Snipe Gallinago gallinago | 1 | 1 | 0 |
| Terek Sandpiper Xenus cinereus | Common Crossbill Loxia curvirostra | 1 | 1 | 0 |
| Green Sandpiper Tringa ochropus | Spotted Redshank Tringa erythropus | 1 | 1 | 0 |
| Common Redshank Tringa totanus | Ruff Calidris pugnax | 1 | 1 | 0 |
| Ruff Calidris pugnax | Buff-breasted Sandpiper Calidris subruficollis | 1 | 0 | 1 |
| Sanderling Calidris alba | Pectoral Sandpiper Calidris melanotos | 1 | 0 | 1 |
| Pallas's Gull Ichthyaetus ichthyaetus | Mediterranean Gull Ichthyaetus melanocephalus | 1 | 0 | 1 |
| Audouin's Gull Ichthyaetus audouinii | Mediterranean Gull Ichthyaetus melanocephalus | 1 | 0 | 1 |
| Little Tern Sternula albifrons | Gull-billed Tern Gelochelidon nilotica | 1 | 0 | 1 |
| Arctic Tern Sterna paradisaea | Common Tern Sterna hirundo | 1 | 1 | 0 |
| European Storm-Petrel Hydrobates pelagicus | Yelkouan Shearwater Puffinus yelkouan | 1 | 1 | 0 |
| Cory's Shearwater Calonectris diomedea | Yelkouan Shearwater Puffinus yelkouan | 1 | 0 | 1 |
| Yelkouan Shearwater Puffinus yelkouan | Balearic Shearwater Puffinus mauretanicus | 1 | 0 | 1 |
| Little Egret Egretta garzetta | Squacco Heron Ardeola ralloides | 1 | 1 | 0 |
| Western Cattle-Egret Ardea ibis | Spotted Nutcracker Nucifraga caryocatactes | 1 | 1 | 0 |
| Lesser Spotted Eagle Clanga pomarina | Booted Eagle Hieraaetus pennatus | 1 | 1 | 0 |
| Booted Eagle Hieraaetus pennatus | Rough-legged Buzzard Buteo lagopus | 1 | 1 | 0 |
| Bonelli's Eagle Aquila fasciata | Western Marsh Harrier Circus aeruginosus | 1 | 1 | 0 |
| Eurasian Sparrowhawk Accipiter nisus | Eurasian Goshawk Astur gentilis | 1 | 0 | 1 |
| Eurasian Goshawk Astur gentilis | Red-backed Shrike Lanius collurio | 1 | 1 | 0 |
| Rough-legged Buzzard Buteo lagopus | Long-legged Buzzard Buteo rufinus | 1 | 1 | 0 |
| Tawny Owl Strix aluco | Long-eared Owl Asio otus | 1 | 1 | 0 |
| Middle Spotted Woodpecker Dendrocoptes medius | Lesser Spotted Woodpecker Dryobates minor | 1 | 0 | 1 |
| Lesser Kestrel Falco naumanni | Red-footed Falcon Falco vespertinus | 1 | 0 | 1 |
| Saker Falcon Falco cherrug | Peregrine Falcon Falco peregrinus | 1 | 1 | 0 |
| Red-backed Shrike Lanius collurio | Lesser Grey Shrike Lanius minor | 1 | 0 | 1 |
| Eurasian/Green-winged Teal Anas crecca | Spotted Nutcracker Nucifraga caryocatactes | 1 | 0 | 1 |
| Spotted Nutcracker Nucifraga caryocatactes | Eurasian Blackcap Sylvia atricapilla | 1 | 1 | 0 |
| Carrion Crow Corvus corone | Hooded Crow Corvus cornix | 1 | 1 | 0 |
| Marsh Tit Poecile palustris | African Blue Tit Cyanistes teneriffae | 1 | 1 | 0 |
| Greater Short-toed Lark Calandrella brachydactyla | Eurasian Skylark Alauda arvensis | 1 | 1 | 0 |
| Greater Short-toed Lark Calandrella brachydactyla | Woodlark Lullula arborea | 1 | 0 | 1 |
| Eurasian Hobby Falco subbuteo | Crested Lark Galerida cristata | 1 | 0 | 1 |
| Paddyfield Warbler Acrocephalus agricola | Common Reed Warbler Acrocephalus scirpaceus | 1 | 1 | 0 |
| Moustached Warbler Acrocephalus melanopogon | Marsh Warbler Acrocephalus palustris | 1 | 0 | 1 |
| Common Reed Warbler Acrocephalus scirpaceus | Great Reed Warbler Acrocephalus arundinaceus | 1 | 1 | 0 |
| Wood Warbler Phylloscopus sibilatrix | Common Chiffchaff Phylloscopus collybita | 1 | 1 | 0 |
| Cetti's Warbler Cettia cetti | Alpine Accentor Prunella collaris | 1 | 1 | 0 |
| Greater Scaup Aythya marila | Sardinian Warbler Curruca melanocephala | 1 | 0 | 1 |
| Western Subalpine Warbler Curruca iberiae | Dartford Warbler Curruca undata | 1 | 1 | 0 |
| Dartford Warbler Curruca undata | Richard's Pipit Anthus richardi | 1 | 1 | 0 |
| Great Tit Parus major | Common Firecrest Regulus ignicapilla | 1 | 0 | 1 |
| Spotted Nutcracker Nucifraga caryocatactes | Short-toed Treecreeper Certhia brachydactyla | 1 | 0 | 1 |
| Eurasian Blue Tit Cyanistes caeruleus | Spotless Starling Sturnus unicolor | 1 | 0 | 1 |
| Spotless Starling Sturnus unicolor | Common Chaffinch Fringilla coelebs | 1 | 1 | 0 |
| Thrush Nightingale Luscinia luscinia | Common Nightingale Luscinia megarhynchos | 1 | 1 | 0 |
| Semicollared Flycatcher Ficedula semitorquata | European Pied Flycatcher Ficedula hypoleuca | 1 | 1 | 0 |
| Eurasian Jay Garrulus glandarius | Black Redstart Phoenicurus ochruros | 1 | 0 | 1 |
| Spanish Sparrow Passer hispaniolensis | Rock Sparrow Petronia petronia | 1 | 1 | 0 |
| Grey Wagtail Motacilla cinerea | Western Yellow Wagtail Motacilla flava | 1 | 1 | 0 |
| Barn Swallow Hirundo rustica | Pied Wagtail/White Wagtail Motacilla alba | 1 | 0 | 1 |
| Blyth's Pipit Anthus godlewskii | Tawny Pipit Anthus campestris | 1 | 0 | 1 |
| Tree Pipit Anthus trivialis | Olive-backed Pipit Anthus hodgsoni | 1 | 0 | 1 |
| Common Swift Apus apus | Common Chaffinch Fringilla coelebs | 1 | 0 | 1 |
| Eurasian Blue Tit Cyanistes caeruleus | Common Chaffinch Fringilla coelebs | 1 | 0 | 1 |
| Western Cattle-Egret Ardea ibis | Brambling Fringilla montifringilla | 1 | 0 | 1 |
| Brambling Fringilla montifringilla | Eurasian Bullfinch Pyrrhula pyrrhula | 1 | 1 | 0 |
| Brambling Fringilla montifringilla | European Greenfinch Chloris chloris | 1 | 1 | 0 |
| Brambling Fringilla montifringilla | European Goldfinch Carduelis carduelis | 1 | 1 | 0 |
| Eurasian/Green-winged Teal Anas crecca | European Greenfinch Chloris chloris | 1 | 0 | 1 |
| Western House Martin Delichon urbicum | European Greenfinch Chloris chloris | 1 | 0 | 1 |
| Black-headed Gull Chroicocephalus ridibundus | European Goldfinch Carduelis carduelis | 1 | 0 | 1 |
| Eurasian Tree Sparrow Passer montanus | Corsican Finch Carduelis corsicana | 1 | 0 | 1 |
| Aquatic Warbler Acrocephalus paludicola | Eurasian Siskin Spinus spinus | 1 | 0 | 1 |