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 |
|---|---|---|---|---|
| Greater Yellowlegs Tringa melanoleuca | Stilt Sandpiper Calidris himantopus | 4 | 3 | 1 |
| Palm Warbler Setophaga palmarum | Prairie Warbler Setophaga discolor | 3 | 1 | 2 |
| Semipalmated Plover Charadrius semipalmatus | Wilson's Plover Anarhynchus wilsonia | 3 | 2 | 1 |
| Spotted Sandpiper Actitis macularius | Lesser Yellowlegs Tringa flavipes | 3 | 2 | 1 |
| Bahama Mockingbird Mimus gundlachii | Northern Mockingbird Mimus polyglottos | 3 | 2 | 1 |
| Blue-winged Teal Spatula discors | White-cheeked Pintail Anas bahamensis | 3 | 2 | 1 |
| Forster's Tern Sterna forsteri | Roseate Tern Sterna dougallii | 2 | 1 | 1 |
| Bridled Tern Onychoprion anaethetus | Roseate Tern Sterna dougallii | 2 | 0 | 2 |
| Laughing Gull Leucophaeus atricilla | Herring Gull Larus argentatus | 2 | 1 | 1 |
| Yellow-throated Warbler Setophaga dominica | Prairie Warbler Setophaga discolor | 2 | 0 | 2 |
| Thick-billed Vireo Vireo crassirostris | Black-whiskered Vireo Vireo altiloquus | 2 | 0 | 2 |
| Least Tern Sternula antillarum | Sandwich Tern Thalasseus sandvicensis | 2 | 2 | 0 |
| Yellow Warbler Setophaga petechia | Palm Warbler Setophaga palmarum | 2 | 1 | 1 |
| Whimbrel Numenius phaeopus | Wilson's Snipe Gallinago delicata | 2 | 0 | 2 |
| Brown Noddy Anous stolidus | Black Noddy Anous minutus | 2 | 1 | 1 |
| Short-billed Dowitcher Limnodromus griseus | Spotted Sandpiper Actitis macularius | 2 | 2 | 0 |
| Cape May Warbler Setophaga tigrina | Blackpoll Warbler Setophaga striata | 2 | 2 | 0 |
| Western Cattle-Egret Ardea ibis | Great White Egret Ardea alba | 2 | 2 | 0 |
| Ring-billed Gull Larus delawarensis | Great Black-backed Gull Larus marinus | 1 | 0 | 1 |
| Sooty Tern Onychoprion fuscatus | Bridled Tern Onychoprion anaethetus | 1 | 0 | 1 |
| Bridled Tern Onychoprion anaethetus | Gull-billed Tern Gelochelidon nilotica | 1 | 0 | 1 |
| Bridled Tern Onychoprion anaethetus | Forster's Tern Sterna forsteri | 1 | 0 | 1 |
| Bridled Tern Onychoprion anaethetus | Sandwich Tern Thalasseus sandvicensis | 1 | 0 | 1 |
| Least Tern Sternula antillarum | Forster's Tern Sterna forsteri | 1 | 0 | 1 |
| Forster's Tern Sterna forsteri | Royal Tern Thalasseus maximus | 1 | 0 | 1 |
| Northern Gannet Morus bassanus | Brown Booby Sula leucogaster | 1 | 0 | 1 |
| Double-crested Cormorant Nannopterum auritum | Neotropic Cormorant Nannopterum brasilianum | 1 | 0 | 1 |
| Tricoloured Heron Egretta tricolor | Reddish Egret Egretta rufescens | 1 | 1 | 0 |
| Tricoloured Heron Egretta tricolor | Great White Egret Ardea alba | 1 | 1 | 0 |
| Belted Kingfisher Megaceryle alcyon | American Kestrel Falco sparverius | 1 | 1 | 0 |
| American Kestrel Falco sparverius | Merlin Falco columbarius | 1 | 1 | 0 |
| Thick-billed Vireo Vireo crassirostris | Red-eyed Vireo Vireo olivaceus | 1 | 0 | 1 |
| Barn Swallow Hirundo rustica | Blue-grey Gnatcatcher Polioptila caerulea | 1 | 1 | 0 |
| Blue-grey Gnatcatcher Polioptila caerulea | Bahama Mockingbird Mimus gundlachii | 1 | 1 | 0 |
| Pearly-eyed Thrasher Margarops fuscatus | Northern Mockingbird Mimus polyglottos | 1 | 1 | 0 |
| Swainson's Thrush Catharus ustulatus | Clay-coloured Sparrow Spizella pallida | 1 | 0 | 1 |
| Chipping Sparrow Spizella passerina | Clay-coloured Sparrow Spizella pallida | 1 | 1 | 0 |
| Western Spindalis Spindalis zena | Northern Waterthrush Parkesia noveboracensis | 1 | 1 | 0 |
| Common Yellowthroat Geothlypis trichas | Northern Parula Setophaga americana | 1 | 1 | 0 |
| Northern Parula Setophaga americana | Blackpoll Warbler Setophaga striata | 1 | 0 | 1 |
| Blackpoll Warbler Setophaga striata | Yellow-rumped Warbler Setophaga coronata | 1 | 0 | 1 |
| Palm Warbler Setophaga palmarum | Yellow-rumped Warbler Setophaga coronata | 1 | 1 | 0 |
| Summer Tanager Piranga rubra | Scarlet Tanager Piranga olivacea | 1 | 1 | 0 |
| Indigo Bunting Passerina cyanea | Greater Antillean Bullfinch Melopyrrha violacea | 1 | 1 | 0 |
| Indigo Bunting Passerina cyanea | Black-faced Grassquit Melanospiza bicolor | 1 | 0 | 1 |
| Greater Antillean Bullfinch Melopyrrha violacea | Black-faced Grassquit Melanospiza bicolor | 1 | 1 | 0 |
| Lesser Scaup Aythya affinis | Ruddy Duck Oxyura jamaicensis | 1 | 0 | 1 |
| Least Grebe Tachybaptus dominicus | Common Ground Dove Columbina passerina | 1 | 0 | 1 |
| White-winged Dove Zenaida asiatica | Zenaida Dove Zenaida aurita | 1 | 1 | 0 |
| Zenaida Dove Zenaida aurita | Mourning Dove Zenaida macroura | 1 | 1 | 0 |
| Chimney Swift Chaetura pelagica | Antillean Palm Swift Tachornis phoenicobia | 1 | 0 | 1 |
| American Moorhen Gallinula galeata | American Coot Fulica americana | 1 | 0 | 1 |
| Grey Plover Pluvialis squatarola | Wilson's Plover Anarhynchus wilsonia | 1 | 0 | 1 |
| Wilson's Phalarope Phalaropus tricolor | Spotted Sandpiper Actitis macularius | 1 | 0 | 1 |
| Spotted Sandpiper Actitis macularius | Willet Tringa semipalmata | 1 | 0 | 1 |
| Lesser Yellowlegs Tringa flavipes | Greater Yellowlegs Tringa melanoleuca | 1 | 0 | 1 |
| Ruddy Turnstone Arenaria interpres | Sanderling Calidris alba | 1 | 0 | 1 |
| Sanderling Calidris alba | Least Sandpiper Calidris minutilla | 1 | 1 | 0 |
| Sanderling Calidris alba | Western Sandpiper Calidris mauri | 1 | 0 | 1 |
| White-rumped Sandpiper Calidris fuscicollis | Least Sandpiper Calidris minutilla | 1 | 1 | 0 |
| Least Sandpiper Calidris minutilla | Semipalmated Sandpiper Calidris pusilla | 1 | 1 | 0 |
| Pectoral Sandpiper Calidris melanotos | Semipalmated Sandpiper Calidris pusilla | 1 | 1 | 0 |
| Laughing Gull Leucophaeus atricilla | Brown Noddy Anous stolidus | 1 | 0 | 1 |