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 |
|---|---|---|---|---|
| Sooty Shearwater Ardenna grisea | Short-tailed Shearwater Ardenna tenuirostris | 6 | 1 | 5 |
| Wedge-tailed Shearwater Ardenna pacifica | Black-vented Shearwater Puffinus opisthomelas | 4 | 4 | 0 |
| Wilson's Storm-Petrel Oceanites oceanicus | Black Storm-Petrel Hydrobates melania | 2 | 1 | 1 |
| Laysan Albatross Phoebastria immutabilis | Short-tailed Albatross Phoebastria albatrus | 2 | 0 | 2 |
| Flesh-footed Shearwater Ardenna carneipes | Sooty Shearwater Ardenna grisea | 2 | 1 | 1 |
| Flesh-footed Shearwater Ardenna carneipes | Black-vented Shearwater Puffinus opisthomelas | 2 | 0 | 2 |
| Great Shearwater Ardenna gravis | Wedge-tailed Shearwater Ardenna pacifica | 2 | 2 | 0 |
| Wedge-tailed Shearwater Ardenna pacifica | Sooty Shearwater Ardenna grisea | 2 | 2 | 0 |
| Wedge-tailed Shearwater Ardenna pacifica | Short-tailed Shearwater Ardenna tenuirostris | 2 | 1 | 1 |
| Sooty Shearwater Ardenna grisea | Black-vented Shearwater Puffinus opisthomelas | 2 | 0 | 2 |
| Fork-tailed Storm-Petrel Hydrobates furcatus | Northern Fulmar Fulmarus glacialis | 1 | 1 | 0 |
| Black Storm-Petrel Hydrobates melania | Scissor-tailed Flycatcher Tyrannus forficatus | 1 | 0 | 1 |
| Hawaiian Petrel Pterodroma sandwichensis | Great Shearwater Ardenna gravis | 1 | 0 | 1 |
| Hawaiian Petrel Pterodroma sandwichensis | Wedge-tailed Shearwater Ardenna pacifica | 1 | 1 | 0 |
| Flesh-footed Shearwater Ardenna carneipes | Great Shearwater Ardenna gravis | 1 | 0 | 1 |
| Flesh-footed Shearwater Ardenna carneipes | Wedge-tailed Shearwater Ardenna pacifica | 1 | 0 | 1 |
| Osprey Pandion haliaetus | Bald Eagle Haliaeetus leucocephalus | 1 | 1 | 0 |
| Black Phoebe Sayornis nigricans | Say's Phoebe Sayornis saya | 1 | 0 | 1 |
| Great Crested Flycatcher Myiarchus crinitus | Common Yellowthroat Geothlypis trichas | 1 | 1 | 0 |
| Sedge Wren Cistothorus stellaris | Evening Grosbeak Hesperiphona vespertina | 1 | 1 | 0 |
| Sage Thrasher Oreoscoptes montanus | Sprague's Pipit Anthus spragueii | 1 | 1 | 0 |
| Swainson's Thrush Catharus ustulatus | Wood Thrush Hylocichla mustelina | 1 | 0 | 1 |
| American Goldfinch Spinus tristis | White-crowned Sparrow Zonotrichia leucophrys | 1 | 0 | 1 |
| Broad-billed Hummingbird Cynanthus latirostris | Tennessee Warbler Leiothlypis peregrina | 1 | 0 | 1 |
| Grasshopper Sparrow Ammodramus savannarum | Chipping Sparrow Spizella passerina | 1 | 0 | 1 |
| Short-billed Dowitcher Limnodromus griseus | Sooty Shearwater Ardenna grisea | 1 | 1 | 0 |
| Franklin's Gull Leucophaeus pipixcan | Black-vented Shearwater Puffinus opisthomelas | 1 | 0 | 1 |
| Western Gull Larus occidentalis | Great Shearwater Ardenna gravis | 1 | 0 | 1 |
| Red-throated Diver Gavia stellata | Pacific Diver Gavia pacifica | 1 | 0 | 1 |
| Laysan Albatross Phoebastria immutabilis | Curve-billed Thrasher Toxostoma curvirostre | 1 | 0 | 1 |
| Black-footed Albatross Phoebastria nigripes | Short-tailed Albatross Phoebastria albatrus | 1 | 1 | 0 |
| Black-footed Albatross Phoebastria nigripes | Fork-tailed Storm-Petrel Hydrobates furcatus | 1 | 1 | 0 |
| Short-tailed Albatross Phoebastria albatrus | Wilson's Storm-Petrel Oceanites oceanicus | 1 | 1 | 0 |
| Fork-tailed Storm-Petrel Hydrobates furcatus | Black Storm-Petrel Hydrobates melania | 1 | 1 | 0 |