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 |
|---|---|---|---|---|
| Least Flycatcher Empidonax minimus | Western Kingbird Tyrannus verticalis | 3 | 2 | 1 |
| Red-throated Diver Gavia stellata | Great Northern Diver Gavia immer | 2 | 1 | 1 |
| Townsend's Solitaire Myadestes townsendi | Grey-cheeked Thrush Catharus minimus | 2 | 1 | 1 |
| Barrow's Goldeneye Bucephala islandica | Hooded Merganser Lophodytes cucullatus | 2 | 1 | 1 |
| MacGillivray's Warbler Geothlypis tolmiei | Mourning Warbler Geothlypis philadelphia | 2 | 1 | 1 |
| Least Sandpiper Calidris minutilla | Pectoral Sandpiper Calidris melanotos | 2 | 2 | 0 |
| Cackling Goose Branta hutchinsii | Red-breasted Goose Branta ruficollis | 1 | 0 | 1 |
| Cackling Goose Branta hutchinsii | Goosander Mergus merganser | 1 | 0 | 1 |
| Red-breasted Goose Branta ruficollis | Egyptian Goose Alopochen aegyptiaca | 1 | 1 | 0 |
| South African Shelduck Tadorna cana | King Eider Somateria spectabilis | 1 | 1 | 0 |
| South African Shelduck Tadorna cana | Common Eider Somateria mollissima | 1 | 1 | 0 |
| South African Shelduck Tadorna cana | Lapland Bunting Calcarius lapponicus | 1 | 1 | 0 |
| Muscovy Duck Cairina moschata | Surf Scoter Melanitta perspicillata | 1 | 0 | 1 |
| Mandarin Duck Aix galericulata | Ruddy Duck Oxyura jamaicensis | 1 | 0 | 1 |
| Mandarin Duck Aix galericulata | Slavonian Grebe Podiceps auritus | 1 | 1 | 0 |
| Northern Shoveler Spatula clypeata | Common Eider Somateria mollissima | 1 | 0 | 1 |
| American Wigeon Mareca americana | American Black Duck Anas rubripes | 1 | 1 | 0 |
| White-cheeked Pintail Anas bahamensis | Red-breasted Merganser Mergus serrator | 1 | 1 | 0 |
| King Eider Somateria spectabilis | Slavonian Grebe Podiceps auritus | 1 | 0 | 1 |
| Long-tailed Duck Clangula hyemalis | Common Goldeneye Bucephala clangula | 1 | 0 | 1 |
| Bufflehead Bucephala albeola | Barrow's Goldeneye Bucephala islandica | 1 | 0 | 1 |
| Gambel's Quail Callipepla gambelii | Common Quail Coturnix coturnix | 1 | 1 | 0 |
| Rock Ptarmigan Lagopus muta | Reeves's Pheasant Syrmaticus reevesii | 1 | 0 | 1 |
| Indian Peafowl Pavo cristatus | Pectoral Sandpiper Calidris melanotos | 1 | 0 | 1 |
| Common Quail Coturnix coturnix | Northern Gannet Morus bassanus | 1 | 1 | 0 |
| Slavonian Grebe Podiceps auritus | Western Grebe Aechmophorus occidentalis | 1 | 1 | 0 |
| Ruby-throated Hummingbird Archilochus colubris | Rufous Hummingbird Selasphorus rufus | 1 | 1 | 0 |
| Black-necked Stilt Himantopus mexicanus | Killdeer Charadrius vociferus | 1 | 1 | 0 |
| American Avocet Recurvirostra americana | Long-billed Dowitcher Limnodromus scolopaceus | 1 | 1 | 0 |
| Hudsonian Godwit Limosa haemastica | Short-billed Dowitcher Limnodromus griseus | 1 | 0 | 1 |
| Hudsonian Godwit Limosa haemastica | Long-billed Dowitcher Limnodromus scolopaceus | 1 | 1 | 0 |
| Marbled Godwit Limosa fedoa | Long-billed Dowitcher Limnodromus scolopaceus | 1 | 0 | 1 |
| Marbled Godwit Limosa fedoa | American Herring Gull Larus smithsonianus | 1 | 1 | 0 |
| American Woodcock Scolopax minor | Wilson's Snipe Gallinago delicata | 1 | 1 | 0 |
| Wilson's Phalarope Phalaropus tricolor | Red-necked Phalarope Phalaropus lobatus | 1 | 1 | 0 |
| Ruff Calidris pugnax | Purple Sandpiper Calidris maritima | 1 | 1 | 0 |
| Pectoral Sandpiper Calidris melanotos | Western Sandpiper Calidris mauri | 1 | 1 | 0 |
| Western Sandpiper Calidris mauri | Pomarine Skua Stercorarius pomarinus | 1 | 0 | 1 |
| Razorbill Alca torda | Ancient Murrelet Synthliboramphus antiquus | 1 | 0 | 1 |
| Sabine's Gull Xema sabini | Franklin's Gull Leucophaeus pipixcan | 1 | 0 | 1 |
| Yellow-bellied Sapsucker Sphyrapicus varius | Black-backed Woodpecker Picoides arcticus | 1 | 1 | 0 |
| Red-headed Lovebird Agapornis pullarius | Northern Red Bishop Euplectes franciscanus | 1 | 0 | 1 |
| Eastern Wood-Pewee Contopus virens | Saffron Finch Sicalis flaveola | 1 | 1 | 0 |
| Yellow-bellied Flycatcher Empidonax flaviventris | Western Kingbird Tyrannus verticalis | 1 | 1 | 0 |
| Western Flycatcher Empidonax difficilis | Great Crested Flycatcher Myiarchus crinitus | 1 | 1 | 0 |
| Say's Phoebe Sayornis saya | Western Kingbird Tyrannus verticalis | 1 | 1 | 0 |
| Great Crested Flycatcher Myiarchus crinitus | Purple Martin Progne subis | 1 | 0 | 1 |
| Violet-green Swallow Tachycineta thalassina | Northern Rough-winged Swallow Stelgidopteryx serripennis | 1 | 1 | 0 |
| Winter Wren Troglodytes hiemalis | Blackpoll Warbler Setophaga striata | 1 | 0 | 1 |
| Common Hill Myna Gracula religiosa | Buff-bellied Pipit Anthus rubescens | 1 | 1 | 0 |
| Brown Thrasher Toxostoma rufum | Hermit Thrush Catharus guttatus | 1 | 1 | 0 |
| Eastern Bluebird Sialia sialis | Mountain Bluebird Sialia currucoides | 1 | 0 | 1 |
| Eastern Bluebird Sialia sialis | Grey-cheeked Thrush Catharus minimus | 1 | 1 | 0 |
| Townsend's Solitaire Myadestes townsendi | Varied Thrush Ixoreus naevius | 1 | 0 | 1 |
| Varied Thrush Ixoreus naevius | Mourning Warbler Geothlypis philadelphia | 1 | 1 | 0 |
| Grey-cheeked Thrush Catharus minimus | Bicknell's Thrush Catharus bicknelli | 1 | 0 | 1 |
| Swainson's Thrush Catharus ustulatus | Ovenbird Seiurus aurocapilla | 1 | 1 | 0 |
| American Robin Turdus migratorius | Fieldfare Turdus pilaris | 1 | 0 | 1 |
| Bohemian Waxwing Bombycilla garrulus | Cedar Waxwing Bombycilla cedrorum | 1 | 1 | 0 |
| Northern Red Bishop Euplectes franciscanus | Java Sparrow Padda oryzivora | 1 | 0 | 1 |
| Northern Red Bishop Euplectes franciscanus | Pine Grosbeak Pinicola enucleator | 1 | 0 | 1 |
| Pine Siskin Spinus pinus | Redpoll Acanthis flammea | 1 | 1 | 0 |
| Clay-coloured Sparrow Spizella pallida | Lark Bunting Calamospiza melanocorys | 1 | 1 | 0 |
| Lark Sparrow Chondestes grammacus | Song Sparrow Melospiza melodia | 1 | 0 | 1 |
| Lark Bunting Calamospiza melanocorys | Fox Sparrow Passerella iliaca | 1 | 1 | 0 |
| Yellow-headed Blackbird Xanthocephalus xanthocephalus | American Redstart Setophaga ruticilla | 1 | 1 | 0 |
| Black-and-white Warbler Mniotilta varia | Swainson's Warbler Limnothlypis swainsonii | 1 | 0 | 1 |
| Orange-crowned Warbler Leiothlypis celata | Virginia's Warbler Leiothlypis virginiae | 1 | 0 | 1 |
| Nashville Warbler Leiothlypis ruficapilla | Connecticut Warbler Oporornis agilis | 1 | 0 | 1 |
| Connecticut Warbler Oporornis agilis | Kentucky Warbler Geothlypis formosa | 1 | 1 | 0 |
| Common Yellowthroat Geothlypis trichas | Wilson's Warbler Cardellina pusilla | 1 | 0 | 1 |
| Cape May Warbler Setophaga tigrina | Magnolia Warbler Setophaga magnolia | 1 | 1 | 0 |
| Northern Parula Setophaga americana | Magnolia Warbler Setophaga magnolia | 1 | 1 | 0 |
| Bay-breasted Warbler Setophaga castanea | Saffron Finch Sicalis flaveola | 1 | 0 | 1 |
| Yellow-throated Warbler Setophaga dominica | Grace's Warbler Setophaga graciae | 1 | 0 | 1 |
| Grace's Warbler Setophaga graciae | Townsend's Warbler Setophaga townsendi | 1 | 0 | 1 |
| Townsend's Warbler Setophaga townsendi | Black-throated Green Warbler Setophaga virens | 1 | 0 | 1 |
| Snow Goose Anser caerulescens | Ross's Goose Anser rossii | 1 | 0 | 1 |
| Hermit Warbler Setophaga occidentalis | Canada Warbler Cardellina canadensis | 1 | 1 | 0 |
| Snow Goose Anser caerulescens | Snow Bunting Plectrophenax nivalis | 1 | 1 | 0 |
| Swan Goose Anser cygnoides | Greater White-fronted Goose Anser albifrons | 1 | 1 | 0 |
| Swan Goose Anser cygnoides | Brent Goose Branta bernicla | 1 | 0 | 1 |
| Swan Goose Anser cygnoides | South African Shelduck Tadorna cana | 1 | 1 | 0 |
| Brent Goose Branta bernicla | Black Scoter Melanitta americana | 1 | 0 | 1 |