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 |
|---|---|---|---|---|
| Cackling Goose Branta hutchinsii | Canada Goose Branta canadensis | 1 | 1 | 0 |
| White-tailed Ptarmigan Lagopus leucura | Willow Ptarmigan Lagopus lagopus | 1 | 0 | 1 |
| Willow Ptarmigan Lagopus lagopus | Rock Ptarmigan Lagopus muta | 1 | 1 | 0 |
| Western Grebe Aechmophorus occidentalis | Clark's Grebe Aechmophorus clarkii | 1 | 0 | 1 |
| Lesser Nighthawk Chordeiles acutipennis | Common Nighthawk Chordeiles minor | 1 | 1 | 0 |
| Calliope Hummingbird Selasphorus calliope | Rufous Hummingbird Selasphorus rufus | 1 | 1 | 0 |
| Common Ringed Plover Charadrius hiaticula | Semipalmated Plover Charadrius semipalmatus | 1 | 1 | 0 |
| Snowy Plover Anarhynchus nivosus | Kentish Plover Anarhynchus alexandrinus | 1 | 0 | 1 |
| Black-tailed Godwit Limosa limosa | Marbled Godwit Limosa fedoa | 1 | 0 | 1 |
| Wandering Tattler Tringa incana | Willet Tringa semipalmata | 1 | 1 | 0 |
| Rock Sandpiper Calidris ptilocnemis | White-rumped Sandpiper Calidris fuscicollis | 1 | 0 | 1 |
| Western Gull Larus occidentalis | Slaty-backed Gull Larus schistisagus | 1 | 0 | 1 |
| Glaucous-winged Gull Larus glaucescens | Iceland Gull Larus glaucoides | 1 | 0 | 1 |
| Brown Booby Sula leucogaster | Cocos Booby Sula brewsteri | 1 | 0 | 1 |
| Flammulated Owl Psiloscops flammeolus | Great Horned Owl Bubo virginianus | 1 | 1 | 0 |
| Willow Flycatcher Empidonax traillii | Least Flycatcher Empidonax minimus | 1 | 1 | 0 |
| Say's Phoebe Sayornis saya | Ash-throated Flycatcher Myiarchus cinerascens | 1 | 1 | 0 |
| Cassin's Vireo Vireo cassinii | Blue-headed Vireo Vireo solitarius | 1 | 0 | 1 |
| Philadelphia Vireo Vireo philadelphicus | Warbling Vireo Vireo gilvus | 1 | 1 | 0 |
| Steller's Jay Cyanocitta stelleri | Mountain Bluebird Sialia currucoides | 1 | 0 | 1 |
| American Crow Corvus brachyrhynchos | Common Raven Corvus corax | 1 | 1 | 0 |
| Mountain Chickadee Poecile gambeli | Siberian Tit Poecile cinctus | 1 | 1 | 0 |
| Eurasian Skylark Alauda arvensis | Snow Bunting Plectrophenax nivalis | 1 | 1 | 0 |
| Buff-bellied Pipit Anthus rubescens | Siberian Pipit Anthus japonicus | 1 | 1 | 0 |
| Common Rosefinch Carpodacus erythrinus | Pallas's Rosefinch Carpodacus roseus | 1 | 0 | 1 |
| Snow Bunting Plectrophenax nivalis | McKay's Bunting Plectrophenax hyperboreus | 1 | 0 | 1 |
| White-crowned Sparrow Zonotrichia leucophrys | White-throated Sparrow Zonotrichia albicollis | 1 | 1 | 0 |
| Rusty Blackbird Euphagus carolinus | Common Grackle Quiscalus quiscula | 1 | 0 | 1 |
| Palm Warbler Setophaga palmarum | Yellow-rumped Warbler Setophaga coronata | 1 | 1 | 0 |