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 |
|---|---|---|---|---|
| Eastern Bluebird Sialia sialis | Mountain Bluebird Sialia currucoides | 2 | 2 | 0 |
| Ring-necked Duck Aythya collaris | Lesser Scaup Aythya affinis | 2 | 0 | 2 |
| Common Crossbill Loxia curvirostra | Two-barred Crossbill Loxia leucoptera | 2 | 0 | 2 |
| Eurasian/Green-winged Teal Anas crecca | Red-crested Pochard Netta rufina | 1 | 0 | 1 |
| Surf Scoter Melanitta perspicillata | Sora Porzana carolina | 1 | 1 | 0 |
| Hooded Merganser Lophodytes cucullatus | Ruddy Duck Oxyura jamaicensis | 1 | 1 | 0 |
| Ruffed Grouse Bonasa umbellus | Sooty Grouse Dendragapus fuliginosus | 1 | 0 | 1 |
| Black-necked Grebe Podiceps nigricollis | Western Grebe Aechmophorus occidentalis | 1 | 1 | 0 |
| African Collared Dove Streptopelia roseogrisea | Mourning Dove Zenaida macroura | 1 | 1 | 0 |
| American Golden Plover Pluvialis dominica | Semipalmated Plover Charadrius semipalmatus | 1 | 1 | 0 |
| Long-billed Dowitcher Limnodromus scolopaceus | Wilson's Phalarope Phalaropus tricolor | 1 | 1 | 0 |
| Wilson's Phalarope Phalaropus tricolor | Red-necked Phalarope Phalaropus lobatus | 1 | 1 | 0 |
| Lesser Yellowlegs Tringa flavipes | Greater Yellowlegs Tringa melanoleuca | 1 | 1 | 0 |
| Stilt Sandpiper Calidris himantopus | Baird's Sandpiper Calidris bairdii | 1 | 1 | 0 |
| Purple Sandpiper Calidris maritima | Baird's Sandpiper Calidris bairdii | 1 | 0 | 1 |
| White-rumped Sandpiper Calidris fuscicollis | Northern Harrier Circus hudsonius | 1 | 0 | 1 |
| Western Sandpiper Calidris mauri | Semipalmated Sandpiper Calidris pusilla | 1 | 0 | 1 |
| Marbled Murrelet Brachyramphus marmoratus | Common Guillemot Uria aalge | 1 | 0 | 1 |
| Ivory Gull Pagophila eburnea | Sabine's Gull Xema sabini | 1 | 1 | 0 |
| Sabine's Gull Xema sabini | Bonaparte's Gull Chroicocephalus philadelphia | 1 | 1 | 0 |
| California Gull Larus californicus | Glaucous-winged Gull Larus glaucescens | 1 | 1 | 0 |
| California Gull Larus californicus | Iceland Gull Larus glaucoides | 1 | 0 | 1 |
| Brandt's Cormorant Urile penicillatus | Pelagic Cormorant Urile pelagicus | 1 | 0 | 1 |
| Double-crested Cormorant Nannopterum auritum | White-faced Ibis Plegadis chihi | 1 | 0 | 1 |
| White-faced Ibis Plegadis chihi | MacGillivray's Warbler Geothlypis tolmiei | 1 | 0 | 1 |
| Swainson's Hawk Buteo swainsoni | Red-tailed Hawk Buteo jamaicensis | 1 | 1 | 0 |
| Red-tailed Hawk Buteo jamaicensis | Rough-legged Buzzard Buteo lagopus | 1 | 0 | 1 |
| Gyr Falcon Falco rusticolus | Peregrine Falcon Falco peregrinus | 1 | 1 | 0 |
| Cockatiel Nymphicus hollandicus | Budgerigar Melopsittacus undulatus | 1 | 1 | 0 |
| Rosy-faced Lovebird Agapornis roseicollis | Green-cheeked Parakeet Pyrrhura molinae | 1 | 1 | 0 |
| Olive-sided Flycatcher Contopus cooperi | Magnolia Warbler Setophaga magnolia | 1 | 0 | 1 |
| Yellow-bellied Flycatcher Empidonax flaviventris | Willow Flycatcher Empidonax traillii | 1 | 1 | 0 |
| Alder Flycatcher Empidonax alnorum | Willow Flycatcher Empidonax traillii | 1 | 1 | 0 |
| Western Flycatcher Empidonax difficilis | Nashville Warbler Leiothlypis ruficapilla | 1 | 1 | 0 |
| Eastern Phoebe Sayornis phoebe | Say's Phoebe Sayornis saya | 1 | 0 | 1 |
| Eastern Phoebe Sayornis phoebe | Western Kingbird Tyrannus verticalis | 1 | 1 | 0 |
| Sand Martin Riparia riparia | Northern Rough-winged Swallow Stelgidopteryx serripennis | 1 | 1 | 0 |
| Sedge Wren Cistothorus stellaris | Marsh Wren Cistothorus palustris | 1 | 1 | 0 |
| Townsend's Solitaire Myadestes townsendi | Lark Bunting Calamospiza melanocorys | 1 | 1 | 0 |
| Swainson's Thrush Catharus ustulatus | Wood Thrush Hylocichla mustelina | 1 | 0 | 1 |
| Buff-bellied Pipit Anthus rubescens | Sprague's Pipit Anthus spragueii | 1 | 0 | 1 |
| Lapland Bunting Calcarius lapponicus | Smith's Longspur Calcarius pictus | 1 | 0 | 1 |
| Grasshopper Sparrow Ammodramus savannarum | Clay-coloured Sparrow Spizella pallida | 1 | 0 | 1 |
| Lark Sparrow Chondestes grammacus | Lark Bunting Calamospiza melanocorys | 1 | 0 | 1 |
| Harris's Sparrow Zonotrichia querula | LeConte's Sparrow Ammospiza leconteii | 1 | 1 | 0 |
| Nelson's Sparrow Ammospiza nelsoni | Swamp Sparrow Melospiza georgiana | 1 | 0 | 1 |
| Red-winged Blackbird Agelaius phoeniceus | Rusty Blackbird Euphagus carolinus | 1 | 0 | 1 |
| Brown-headed Cowbird Molothrus ater | Brewer's Blackbird Euphagus cyanocephalus | 1 | 1 | 0 |
| Brewer's Blackbird Euphagus cyanocephalus | Common Grackle Quiscalus quiscula | 1 | 0 | 1 |
| Orange-crowned Warbler Leiothlypis celata | Connecticut Warbler Oporornis agilis | 1 | 0 | 1 |
| Connecticut Warbler Oporornis agilis | MacGillivray's Warbler Geothlypis tolmiei | 1 | 1 | 0 |
| Connecticut Warbler Oporornis agilis | Mourning Warbler Geothlypis philadelphia | 1 | 1 | 0 |
| Bay-breasted Warbler Setophaga castanea | Blackburnian Warbler Setophaga fusca | 1 | 0 | 1 |
| Bay-breasted Warbler Setophaga castanea | Chestnut-sided Warbler Setophaga pensylvanica | 1 | 0 | 1 |
| Blackburnian Warbler Setophaga fusca | Chestnut-sided Warbler Setophaga pensylvanica | 1 | 0 | 1 |
| Snow Goose Anser caerulescens | Ross's Goose Anser rossii | 1 | 0 | 1 |
| Indigo Bunting Passerina cyanea | Red-flanked Bluetail Tarsiger cyanurus | 1 | 0 | 1 |
| Trumpeter Swan Cygnus buccinator | Bewick's Swan Cygnus columbianus | 1 | 0 | 1 |
| Ringed Teal Callonetta leucophrys | Blue-winged Teal Spatula discors | 1 | 1 | 0 |