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 Scaup Aythya marila | Lesser Scaup Aythya affinis | 25 | 13 | 12 |
| King Eider Somateria spectabilis | Common Eider Somateria mollissima | 23 | 12 | 11 |
| Surf Scoter Melanitta perspicillata | Black Scoter Melanitta americana | 22 | 14 | 8 |
| Gadwall Mareca strepera | American Wigeon Mareca americana | 17 | 9 | 8 |
| Snow Goose Anser caerulescens | Ross's Goose Anser rossii | 16 | 7 | 9 |
| Goosander Mergus merganser | Red-breasted Merganser Mergus serrator | 15 | 6 | 9 |
| Cackling Goose Branta hutchinsii | Canada Goose Branta canadensis | 14 | 7 | 7 |
| Common Eider Somateria mollissima | White-winged Scoter Melanitta deglandi | 14 | 14 | 0 |
| Trumpeter Swan Cygnus buccinator | Bewick's Swan Cygnus columbianus | 14 | 2 | 12 |
| Common Goldeneye Bucephala clangula | Barrow's Goldeneye Bucephala islandica | 13 | 4 | 9 |
| Black Scoter Melanitta americana | Long-tailed Duck Clangula hyemalis | 13 | 8 | 5 |
| White-winged Scoter Melanitta deglandi | Black Scoter Melanitta americana | 13 | 12 | 1 |
| Canvasback Aythya valisineria | Redhead Aythya americana | 11 | 6 | 5 |
| White-winged Scoter Melanitta deglandi | Long-tailed Duck Clangula hyemalis | 11 | 1 | 10 |
| Hooded Merganser Lophodytes cucullatus | Goosander Mergus merganser | 11 | 5 | 6 |
| Swan Goose Anser cygnoides | Greater White-fronted Goose Anser albifrons | 11 | 8 | 3 |
| Blue-winged Teal Spatula discors | Gadwall Mareca strepera | 11 | 9 | 2 |
| Ring-necked Duck Aythya collaris | Lesser Scaup Aythya affinis | 10 | 2 | 8 |
| Slavonian Grebe Podiceps auritus | Black-necked Grebe Podiceps nigricollis | 10 | 8 | 2 |
| Surf Scoter Melanitta perspicillata | White-winged Scoter Melanitta deglandi | 9 | 3 | 6 |
| Sora Porzana carolina | American Coot Fulica americana | 9 | 6 | 3 |
| Hooded Merganser Lophodytes cucullatus | Red-breasted Merganser Mergus serrator | 9 | 2 | 7 |
| Barrow's Goldeneye Bucephala islandica | Goosander Mergus merganser | 9 | 5 | 4 |
| American Wigeon Mareca americana | Northern Pintail Anas acuta | 9 | 9 | 0 |
| Mallard Anas platyrhynchos | American Black Duck Anas rubripes | 8 | 0 | 8 |
| Blue-winged Teal Spatula discors | American Wigeon Mareca americana | 8 | 8 | 0 |
| King Eider Somateria spectabilis | Harlequin Duck Histrionicus histrionicus | 7 | 3 | 4 |
| Ring-necked Duck Aythya collaris | Greater Scaup Aythya marila | 7 | 3 | 4 |
| Barrow's Goldeneye Bucephala islandica | Hooded Merganser Lophodytes cucullatus | 7 | 3 | 4 |
| Black Scoter Melanitta americana | Bufflehead Bucephala albeola | 7 | 5 | 2 |
| Slavonian Grebe Podiceps auritus | Western Grebe Aechmophorus occidentalis | 7 | 6 | 1 |
| Northern Pintail Anas acuta | Canvasback Aythya valisineria | 6 | 2 | 4 |
| Ross's Goose Anser rossii | Swan Goose Anser cygnoides | 6 | 4 | 2 |
| Common Goldeneye Bucephala clangula | Goosander Mergus merganser | 6 | 5 | 1 |
| Slavonian Grebe Podiceps auritus | Red-necked Grebe Podiceps grisegena | 6 | 3 | 3 |
| Red-necked Grebe Podiceps grisegena | Black-necked Grebe Podiceps nigricollis | 6 | 5 | 1 |
| Blue-winged Teal Spatula discors | Northern Shoveler Spatula clypeata | 6 | 2 | 4 |
| Northern Pintail Anas acuta | Eurasian/Green-winged Teal Anas crecca | 6 | 3 | 3 |
| Brent Goose Branta bernicla | Cackling Goose Branta hutchinsii | 5 | 5 | 0 |
| Bufflehead Bucephala albeola | Common Goldeneye Bucephala clangula | 5 | 3 | 2 |
| American Black Duck Anas rubripes | Eurasian/Green-winged Teal Anas crecca | 5 | 5 | 0 |
| Bufflehead Bucephala albeola | Hooded Merganser Lophodytes cucullatus | 5 | 5 | 0 |
| Lesser Scaup Aythya affinis | Common Eider Somateria mollissima | 5 | 2 | 3 |
| Black-necked Grebe Podiceps nigricollis | Western Grebe Aechmophorus occidentalis | 5 | 4 | 1 |
| Greater White-fronted Goose Anser albifrons | Brent Goose Branta bernicla | 5 | 1 | 4 |
| Goosander Mergus merganser | Ruddy Duck Oxyura jamaicensis | 5 | 2 | 3 |
| Swan Goose Anser cygnoides | Cackling Goose Branta hutchinsii | 5 | 5 | 0 |
| Palm Warbler Setophaga palmarum | Pine Warbler Setophaga pinus | 4 | 2 | 2 |
| Gadwall Mareca strepera | Mallard Anas platyrhynchos | 4 | 4 | 0 |
| Hooded Merganser Lophodytes cucullatus | Ruddy Duck Oxyura jamaicensis | 4 | 0 | 4 |
| Common Goldeneye Bucephala clangula | Hooded Merganser Lophodytes cucullatus | 4 | 3 | 1 |
| Swan Goose Anser cygnoides | Brent Goose Branta bernicla | 4 | 2 | 2 |
| Muscovy Duck Cairina moschata | Northern Shoveler Spatula clypeata | 4 | 4 | 0 |
| Red-necked Grebe Podiceps grisegena | Western Grebe Aechmophorus occidentalis | 4 | 4 | 0 |
| Redhead Aythya americana | Ring-necked Duck Aythya collaris | 4 | 4 | 0 |
| Tennessee Warbler Leiothlypis peregrina | Nashville Warbler Leiothlypis ruficapilla | 4 | 1 | 3 |
| American Wigeon Mareca americana | American Black Duck Anas rubripes | 4 | 2 | 2 |
| Lesser Scaup Aythya affinis | King Eider Somateria spectabilis | 4 | 1 | 3 |
| Red-breasted Merganser Mergus serrator | Ruddy Duck Oxyura jamaicensis | 3 | 2 | 1 |
| Barrow's Goldeneye Bucephala islandica | Red-breasted Merganser Mergus serrator | 3 | 2 | 1 |
| Barrow's Goldeneye Bucephala islandica | Ruddy Duck Oxyura jamaicensis | 3 | 0 | 3 |
| Bufflehead Bucephala albeola | Barrow's Goldeneye Bucephala islandica | 3 | 3 | 0 |
| Snow Goose Anser caerulescens | Swan Goose Anser cygnoides | 3 | 2 | 1 |
| Mallard Anas platyrhynchos | Eurasian/Green-winged Teal Anas crecca | 3 | 3 | 0 |
| Canada Jay Perisoreus canadensis | Snow Bunting Plectrophenax nivalis | 3 | 2 | 1 |
| Black Swan Cygnus atratus | White-winged Scoter Melanitta deglandi | 3 | 1 | 2 |
| Canada Warbler Cardellina canadensis | Wilson's Warbler Cardellina pusilla | 3 | 0 | 3 |
| Northern Pintail Anas acuta | Redhead Aythya americana | 3 | 3 | 0 |
| Muscovy Duck Cairina moschata | Wood Duck Aix sponsa | 3 | 0 | 3 |
| Canvasback Aythya valisineria | Greater Scaup Aythya marila | 3 | 3 | 0 |
| Ovenbird Seiurus aurocapilla | Northern Waterthrush Parkesia noveboracensis | 3 | 0 | 3 |
| Black-legged Kittiwake Rissa tridactyla | Short-billed Gull Larus brachyrhynchus | 3 | 3 | 0 |
| Snow Goose Anser caerulescens | Greater White-fronted Goose Anser albifrons | 3 | 0 | 3 |
| Gadwall Mareca strepera | American Black Duck Anas rubripes | 3 | 3 | 0 |
| Common Yellowthroat Geothlypis trichas | Cape May Warbler Setophaga tigrina | 3 | 1 | 2 |
| Cape May Warbler Setophaga tigrina | Northern Parula Setophaga americana | 3 | 0 | 3 |
| Palm Warbler Setophaga palmarum | Yellow-rumped Warbler Setophaga coronata | 3 | 2 | 1 |
| Common Eider Somateria mollissima | Surf Scoter Melanitta perspicillata | 3 | 2 | 1 |
| Grasshopper Sparrow Ammodramus savannarum | American Tree Sparrow Spizelloides arborea | 2 | 2 | 0 |
| Redhead Aythya americana | Greater Scaup Aythya marila | 2 | 2 | 0 |
| Redhead Aythya americana | Lesser Scaup Aythya affinis | 2 | 2 | 0 |
| Blue-winged Teal Spatula discors | Common Goldeneye Bucephala clangula | 2 | 2 | 0 |
| Black-throated Grey Warbler Setophaga nigrescens | Townsend's Warbler Setophaga townsendi | 2 | 0 | 2 |
| Black-throated Grey Warbler Setophaga nigrescens | Black-throated Green Warbler Setophaga virens | 2 | 1 | 1 |
| Pine Siskin Spinus pinus | American Goldfinch Spinus tristis | 2 | 1 | 1 |
| Bewick's Swan Cygnus columbianus | Muscovy Duck Cairina moschata | 2 | 0 | 2 |
| Blue-winged Teal Spatula discors | Eurasian/Green-winged Teal Anas crecca | 2 | 2 | 0 |
| American Black Duck Anas rubripes | Common Goldeneye Bucephala clangula | 2 | 1 | 1 |
| Harlequin Duck Histrionicus histrionicus | White-winged Scoter Melanitta deglandi | 2 | 2 | 0 |
| Franklin's Gull Leucophaeus pipixcan | Forster's Tern Sterna forsteri | 2 | 0 | 2 |
| Mourning Warbler Geothlypis philadelphia | Common Yellowthroat Geothlypis trichas | 2 | 1 | 1 |
| American Black Duck Anas rubripes | Northern Pintail Anas acuta | 2 | 1 | 1 |
| Gadwall Mareca strepera | Ring-necked Duck Aythya collaris | 2 | 2 | 0 |
| Common Goldeneye Bucephala clangula | Red-breasted Merganser Mergus serrator | 2 | 0 | 2 |
| Common Yellowthroat Geothlypis trichas | Northern Parula Setophaga americana | 2 | 2 | 0 |
| Brent Goose Branta bernicla | Black Swan Cygnus atratus | 2 | 2 | 0 |
| Short-billed Gull Larus brachyrhynchus | American Herring Gull Larus smithsonianus | 2 | 2 | 0 |
| Glaucous-winged Gull Larus glaucescens | American Herring Gull Larus smithsonianus | 2 | 2 | 0 |
| American Wigeon Mareca americana | Common Goldeneye Bucephala clangula | 2 | 2 | 0 |
| Bonaparte's Gull Chroicocephalus philadelphia | Franklin's Gull Leucophaeus pipixcan | 2 | 1 | 1 |
| Black Swan Cygnus atratus | Trumpeter Swan Cygnus buccinator | 2 | 1 | 1 |
| Wood Duck Aix sponsa | Blue-winged Teal Spatula discors | 2 | 0 | 2 |
| American Wigeon Mareca americana | Common Eider Somateria mollissima | 2 | 1 | 1 |
| Chestnut-sided Warbler Setophaga pensylvanica | Black-throated Blue Warbler Setophaga caerulescens | 2 | 1 | 1 |
| Blackpoll Warbler Setophaga striata | Black-throated Blue Warbler Setophaga caerulescens | 2 | 1 | 1 |
| Least Flycatcher Empidonax minimus | Dusky Flycatcher Empidonax oberholseri | 2 | 1 | 1 |
| Great Blue Heron Ardea herodias | White-faced Ibis Plegadis chihi | 2 | 1 | 1 |
| American Wigeon Mareca americana | Lesser Scaup Aythya affinis | 2 | 1 | 1 |
| Pine Warbler Setophaga pinus | Yellow-rumped Warbler Setophaga coronata | 2 | 2 | 0 |
| Harris's Sparrow Zonotrichia querula | Vesper Sparrow Pooecetes gramineus | 2 | 1 | 1 |
| American Woodcock Scolopax minor | Ruddy Turnstone Arenaria interpres | 2 | 1 | 1 |
| Northern Shoveler Spatula clypeata | American Wigeon Mareca americana | 2 | 1 | 1 |
| Cackling Goose Branta hutchinsii | Common Eider Somateria mollissima | 2 | 0 | 2 |
| Long-tailed Duck Clangula hyemalis | Common Goldeneye Bucephala clangula | 2 | 0 | 2 |
| King Eider Somateria spectabilis | Surf Scoter Melanitta perspicillata | 2 | 2 | 0 |
| Muscovy Duck Cairina moschata | Blue-winged Teal Spatula discors | 2 | 0 | 2 |
| Common Eider Somateria mollissima | Harlequin Duck Histrionicus histrionicus | 2 | 0 | 2 |
| Ovenbird Seiurus aurocapilla | Black-and-white Warbler Mniotilta varia | 2 | 1 | 1 |
| Sanderling Calidris alba | White-rumped Sandpiper Calidris fuscicollis | 1 | 1 | 0 |
| Western Sandpiper Calidris mauri | Pomarine Skua Stercorarius pomarinus | 1 | 0 | 1 |
| Arctic Skua Stercorarius parasiticus | Ancient Murrelet Synthliboramphus antiquus | 1 | 0 | 1 |
| Black-legged Kittiwake Rissa tridactyla | Franklin's Gull Leucophaeus pipixcan | 1 | 1 | 0 |
| Black-legged Kittiwake Rissa tridactyla | Glaucous-winged Gull Larus glaucescens | 1 | 1 | 0 |
| Black-legged Kittiwake Rissa tridactyla | Iceland Gull Larus glaucoides | 1 | 0 | 1 |
| Black-legged Kittiwake Rissa tridactyla | Canada Jay Perisoreus canadensis | 1 | 1 | 0 |
| Ivory Gull Pagophila eburnea | Short-billed Gull Larus brachyrhynchus | 1 | 0 | 1 |
| Ivory Gull Pagophila eburnea | Great Black-backed Gull Larus marinus | 1 | 1 | 0 |
| Sabine's Gull Xema sabini | Black-headed Gull Chroicocephalus ridibundus | 1 | 0 | 1 |
| Sabine's Gull Xema sabini | Franklin's Gull Leucophaeus pipixcan | 1 | 1 | 0 |
| Sabine's Gull Xema sabini | Great Black-backed Gull Larus marinus | 1 | 1 | 0 |
| Sabine's Gull Xema sabini | Glaucous Gull Larus hyperboreus | 1 | 1 | 0 |
| Sabine's Gull Xema sabini | Glaucous-winged Gull Larus glaucescens | 1 | 1 | 0 |
| Sabine's Gull Xema sabini | Black Tern Chlidonias niger | 1 | 0 | 1 |
| Bonaparte's Gull Chroicocephalus philadelphia | Short-billed Gull Larus brachyrhynchus | 1 | 0 | 1 |
| Bonaparte's Gull Chroicocephalus philadelphia | Common Tern Sterna hirundo | 1 | 1 | 0 |
| Bonaparte's Gull Chroicocephalus philadelphia | American Herring Gull Larus smithsonianus | 1 | 1 | 0 |
| Franklin's Gull Leucophaeus pipixcan | Great Black-backed Gull Larus marinus | 1 | 1 | 0 |
| Franklin's Gull Leucophaeus pipixcan | Glaucous Gull Larus hyperboreus | 1 | 0 | 1 |
| Franklin's Gull Leucophaeus pipixcan | Iceland Gull Larus glaucoides | 1 | 1 | 0 |
| Short-billed Gull Larus brachyrhynchus | Cedar Waxwing Bombycilla cedrorum | 1 | 1 | 0 |
| Ring-billed Gull Larus delawarensis | Glaucous Gull Larus hyperboreus | 1 | 0 | 1 |
| Glaucous Gull Larus hyperboreus | Arctic Tern Sterna paradisaea | 1 | 1 | 0 |
| Glaucous Gull Larus hyperboreus | Common Tern Sterna hirundo | 1 | 0 | 1 |
| Glaucous Gull Larus hyperboreus | American Herring Gull Larus smithsonianus | 1 | 1 | 0 |
| California Gull Larus californicus | Glaucous-winged Gull Larus glaucescens | 1 | 0 | 1 |
| California Gull Larus californicus | Slaty-backed Gull Larus schistisagus | 1 | 1 | 0 |
| California Gull Larus californicus | Iceland Gull Larus glaucoides | 1 | 0 | 1 |
| California Gull Larus californicus | Common Tern Sterna hirundo | 1 | 1 | 0 |
| California Gull Larus californicus | American Herring Gull Larus smithsonianus | 1 | 1 | 0 |
| Glaucous-winged Gull Larus glaucescens | Arctic Tern Sterna paradisaea | 1 | 1 | 0 |
| Glaucous-winged Gull Larus glaucescens | White-faced Ibis Plegadis chihi | 1 | 1 | 0 |
| Iceland Gull Larus glaucoides | Black Tern Chlidonias niger | 1 | 1 | 0 |
| Iceland Gull Larus glaucoides | American Herring Gull Larus smithsonianus | 1 | 0 | 1 |
| Black Tern Chlidonias niger | Forster's Tern Sterna forsteri | 1 | 1 | 0 |
| Forster's Tern Sterna forsteri | Common Tern Sterna hirundo | 1 | 1 | 0 |
| White-billed Diver Gavia adamsii | Double-crested Cormorant Nannopterum auritum | 1 | 0 | 1 |
| Golden Eagle Aquila chrysaetos | Sharp-shinned Hawk Accipiter striatus | 1 | 1 | 0 |
| Northern Harrier Circus hudsonius | Sharp-shinned Hawk Accipiter striatus | 1 | 1 | 0 |
| Sharp-shinned Hawk Accipiter striatus | Swainson's Hawk Buteo swainsoni | 1 | 1 | 0 |
| Bald Eagle Haliaeetus leucocephalus | Ferruginous Hawk Buteo regalis | 1 | 0 | 1 |
| Broad-winged Hawk Buteo platypterus | Swainson's Hawk Buteo swainsoni | 1 | 1 | 0 |
| Swainson's Hawk Buteo swainsoni | Rough-legged Buzzard Buteo lagopus | 1 | 0 | 1 |
| Yellow-bellied Sapsucker Sphyrapicus varius | Red-naped Sapsucker Sphyrapicus nuchalis | 1 | 0 | 1 |
| Yellow-bellied Sapsucker Sphyrapicus varius | Black-backed Woodpecker Picoides arcticus | 1 | 1 | 0 |
| Northern Flicker Colaptes auratus | Eastern Kingbird Tyrannus tyrannus | 1 | 1 | 0 |
| Merlin Falco columbarius | Peregrine Falcon Falco peregrinus | 1 | 0 | 1 |
| Cockatiel Nymphicus hollandicus | Little Corella Cacatua sanguinea | 1 | 0 | 1 |
| Budgerigar Melopsittacus undulatus | Mitred Parakeet Psittacara mitratus | 1 | 1 | 0 |
| Hammond's Flycatcher Empidonax hammondii | Dusky Flycatcher Empidonax oberholseri | 1 | 0 | 1 |
| Western Flycatcher Empidonax difficilis | Western Kingbird Tyrannus verticalis | 1 | 0 | 1 |
| Say's Phoebe Sayornis saya | Western Kingbird Tyrannus verticalis | 1 | 1 | 0 |
| Great Crested Flycatcher Myiarchus crinitus | Western Kingbird Tyrannus verticalis | 1 | 1 | 0 |
| Eastern Kingbird Tyrannus tyrannus | Fork-tailed Flycatcher Tyrannus savana | 1 | 0 | 1 |
| Cassin's Vireo Vireo cassinii | Blue-headed Vireo Vireo solitarius | 1 | 1 | 0 |
| Cassin's Vireo Vireo cassinii | Canada Warbler Cardellina canadensis | 1 | 0 | 1 |
| Canada Jay Perisoreus canadensis | American Robin Turdus migratorius | 1 | 1 | 0 |
| Steller's Jay Cyanocitta stelleri | Black-billed Magpie Pica hudsonia | 1 | 1 | 0 |
| Black-billed Magpie Pica hudsonia | Clark's Nutcracker Nucifraga columbiana | 1 | 0 | 1 |
| American Crow Corvus brachyrhynchos | Common Raven Corvus corax | 1 | 0 | 1 |
| Sand Martin Riparia riparia | Barn Swallow Hirundo rustica | 1 | 1 | 0 |
| Sand Martin Riparia riparia | Townsend's Solitaire Myadestes townsendi | 1 | 0 | 1 |
| Tree Swallow Tachycineta bicolor | Violet-green Swallow Tachycineta thalassina | 1 | 1 | 0 |
| Tree Swallow Tachycineta bicolor | Purple Martin Progne subis | 1 | 1 | 0 |
| Tree Swallow Tachycineta bicolor | Northern Rough-winged Swallow Stelgidopteryx serripennis | 1 | 0 | 1 |
| Violet-green Swallow Tachycineta thalassina | Northern Rough-winged Swallow Stelgidopteryx serripennis | 1 | 0 | 1 |
| Purple Martin Progne subis | Northern Rough-winged Swallow Stelgidopteryx serripennis | 1 | 0 | 1 |
| Ruby-crowned Kinglet Corthylio calendula | White-breasted Nuthatch Sitta carolinensis | 1 | 1 | 0 |
| Brown Creeper Certhia americana | Black-and-white Warbler Mniotilta varia | 1 | 1 | 0 |
| Northern House Wren Troglodytes aedon | Winter Wren Troglodytes hiemalis | 1 | 0 | 1 |
| Marsh Wren Cistothorus palustris | Brown Thrasher Toxostoma rufum | 1 | 0 | 1 |
| Grey Catbird Dumetella carolinensis | Brown Thrasher Toxostoma rufum | 1 | 0 | 1 |
| Townsend's Solitaire Myadestes townsendi | Varied Thrush Ixoreus naevius | 1 | 1 | 0 |
| Swainson's Thrush Catharus ustulatus | Hermit Thrush Catharus guttatus | 1 | 0 | 1 |
| Swainson's Thrush Catharus ustulatus | Wood Thrush Hylocichla mustelina | 1 | 0 | 1 |
| American Robin Turdus migratorius | Snow Bunting Plectrophenax nivalis | 1 | 1 | 0 |
| Bohemian Waxwing Bombycilla garrulus | Cedar Waxwing Bombycilla cedrorum | 1 | 0 | 1 |
| Evening Grosbeak Hesperiphona vespertina | Townsend's Warbler Setophaga townsendi | 1 | 1 | 0 |
| House Finch Haemorhous mexicanus | Common Crossbill Loxia curvirostra | 1 | 1 | 0 |
| European Goldfinch Carduelis carduelis | Redpoll Acanthis flammea | 1 | 1 | 0 |
| Smith's Longspur Calcarius pictus | Thick-billed Longspur Rhynchophanes mccownii | 1 | 1 | 0 |
| Snow Bunting Plectrophenax nivalis | Bay-breasted Warbler Setophaga castanea | 1 | 1 | 0 |
| American Tree Sparrow Spizelloides arborea | Dark-eyed Junco Junco hyemalis | 1 | 1 | 0 |
| Dark-eyed Junco Junco hyemalis | Chestnut-sided Warbler Setophaga pensylvanica | 1 | 1 | 0 |
| White-throated Sparrow Zonotrichia albicollis | Vesper Sparrow Pooecetes gramineus | 1 | 0 | 1 |
| LeConte's Sparrow Ammospiza leconteii | Savannah Sparrow Passerculus sandwichensis | 1 | 1 | 0 |
| Baird's Sparrow Centronyx bairdii | American Redstart Setophaga ruticilla | 1 | 0 | 1 |
| Baltimore Oriole Icterus galbula | Red-winged Blackbird Agelaius phoeniceus | 1 | 0 | 1 |
| Brown-headed Cowbird Molothrus ater | Brewer's Blackbird Euphagus cyanocephalus | 1 | 1 | 0 |
| Rusty Blackbird Euphagus carolinus | Brewer's Blackbird Euphagus cyanocephalus | 1 | 1 | 0 |
| Ovenbird Seiurus aurocapilla | Nashville Warbler Leiothlypis ruficapilla | 1 | 1 | 0 |
| Ovenbird Seiurus aurocapilla | Chestnut-sided Warbler Setophaga pensylvanica | 1 | 0 | 1 |
| Northern Waterthrush Parkesia noveboracensis | Black-and-white Warbler Mniotilta varia | 1 | 0 | 1 |
| Northern Waterthrush Parkesia noveboracensis | Tennessee Warbler Leiothlypis peregrina | 1 | 1 | 0 |
| Black-and-white Warbler Mniotilta varia | Orange-crowned Warbler Leiothlypis celata | 1 | 1 | 0 |
| Tennessee Warbler Leiothlypis peregrina | Orange-crowned Warbler Leiothlypis celata | 1 | 0 | 1 |
| Tennessee Warbler Leiothlypis peregrina | Connecticut Warbler Oporornis agilis | 1 | 1 | 0 |
| Connecticut Warbler Oporornis agilis | MacGillivray's Warbler Geothlypis tolmiei | 1 | 0 | 1 |
| MacGillivray's Warbler Geothlypis tolmiei | Mourning Warbler Geothlypis philadelphia | 1 | 0 | 1 |
| MacGillivray's Warbler Geothlypis tolmiei | American Redstart Setophaga ruticilla | 1 | 1 | 0 |
| Mourning Warbler Geothlypis philadelphia | Kentucky Warbler Geothlypis formosa | 1 | 0 | 1 |
| Mourning Warbler Geothlypis philadelphia | Cape May Warbler Setophaga tigrina | 1 | 1 | 0 |
| Common Yellowthroat Geothlypis trichas | American Redstart Setophaga ruticilla | 1 | 0 | 1 |
| American Redstart Setophaga ruticilla | Cape May Warbler Setophaga tigrina | 1 | 1 | 0 |
| Cape May Warbler Setophaga tigrina | Magnolia Warbler Setophaga magnolia | 1 | 0 | 1 |
| Magnolia Warbler Setophaga magnolia | Bay-breasted Warbler Setophaga castanea | 1 | 0 | 1 |
| Magnolia Warbler Setophaga magnolia | Blackburnian Warbler Setophaga fusca | 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 | 1 | 0 |
| Blackpoll Warbler Setophaga striata | Pine Warbler Setophaga pinus | 1 | 1 | 0 |
| Yellow-rumped Warbler Setophaga coronata | Black-throated Green Warbler Setophaga virens | 1 | 0 | 1 |
| Yellow-rumped Warbler Setophaga coronata | Wilson's Warbler Cardellina pusilla | 1 | 0 | 1 |
| Townsend's Warbler Setophaga townsendi | Black-throated Green Warbler Setophaga virens | 1 | 0 | 1 |
| Townsend's Warbler Setophaga townsendi | Canada Warbler Cardellina canadensis | 1 | 1 | 0 |
| Black-throated Green Warbler Setophaga virens | Canada Warbler Cardellina canadensis | 1 | 1 | 0 |
| Western Tanager Piranga ludoviciana | Rose-breasted Grosbeak Pheucticus ludovicianus | 1 | 1 | 0 |
| Snow Goose Anser caerulescens | American Wigeon Mareca americana | 1 | 1 | 0 |
| Snow Goose Anser caerulescens | White-winged Scoter Melanitta deglandi | 1 | 0 | 1 |
| Ross's Goose Anser rossii | Greater White-fronted Goose Anser albifrons | 1 | 1 | 0 |
| Ross's Goose Anser rossii | Goosander Mergus merganser | 1 | 0 | 1 |
| Ross's Goose Anser rossii | Ruddy Duck Oxyura jamaicensis | 1 | 0 | 1 |
| Greylag Goose Anser anser | Greater White-fronted Goose Anser albifrons | 1 | 1 | 0 |
| Swan Goose Anser cygnoides | American Black Duck Anas rubripes | 1 | 1 | 0 |
| Swan Goose Anser cygnoides | King Eider Somateria spectabilis | 1 | 1 | 0 |
| Swan Goose Anser cygnoides | White-winged Scoter Melanitta deglandi | 1 | 1 | 0 |
| Greater White-fronted Goose Anser albifrons | Canada Goose Branta canadensis | 1 | 1 | 0 |
| Greater White-fronted Goose Anser albifrons | Northern Pintail Anas acuta | 1 | 1 | 0 |
| Greater White-fronted Goose Anser albifrons | Ring-necked Duck Aythya collaris | 1 | 0 | 1 |
| Brent Goose Branta bernicla | Canada Goose Branta canadensis | 1 | 0 | 1 |
| Brent Goose Branta bernicla | Ring-necked Duck Aythya collaris | 1 | 1 | 0 |
| Brent Goose Branta bernicla | Common Goldeneye Bucephala clangula | 1 | 0 | 1 |
| Cackling Goose Branta hutchinsii | Black Swan Cygnus atratus | 1 | 0 | 1 |
| Cackling Goose Branta hutchinsii | Eurasian/Green-winged Teal Anas crecca | 1 | 0 | 1 |
| Cackling Goose Branta hutchinsii | Canvasback Aythya valisineria | 1 | 0 | 1 |
| Cackling Goose Branta hutchinsii | Ruddy Duck Oxyura jamaicensis | 1 | 0 | 1 |
| Canada Goose Branta canadensis | Black Swan Cygnus atratus | 1 | 0 | 1 |
| Canada Goose Branta canadensis | Trumpeter Swan Cygnus buccinator | 1 | 0 | 1 |
| Canada Goose Branta canadensis | Common Goldeneye Bucephala clangula | 1 | 0 | 1 |
| Canada Goose Branta canadensis | Canada Jay Perisoreus canadensis | 1 | 0 | 1 |
| Black Swan Cygnus atratus | Bewick's Swan Cygnus columbianus | 1 | 0 | 1 |
| Black Swan Cygnus atratus | Surf Scoter Melanitta perspicillata | 1 | 1 | 0 |
| Black Swan Cygnus atratus | Goosander Mergus merganser | 1 | 1 | 0 |
| Black Swan Cygnus atratus | Ruddy Duck Oxyura jamaicensis | 1 | 0 | 1 |
| Trumpeter Swan Cygnus buccinator | Ruddy Duck Oxyura jamaicensis | 1 | 0 | 1 |
| Muscovy Duck Cairina moschata | American Wigeon Mareca americana | 1 | 1 | 0 |
| Muscovy Duck Cairina moschata | Mallard Anas platyrhynchos | 1 | 0 | 1 |
| Muscovy Duck Cairina moschata | Greater Scaup Aythya marila | 1 | 0 | 1 |
| Muscovy Duck Cairina moschata | Surf Scoter Melanitta perspicillata | 1 | 0 | 1 |
| Muscovy Duck Cairina moschata | Ruddy Duck Oxyura jamaicensis | 1 | 0 | 1 |
| Muscovy Duck Cairina moschata | American Woodcock Scolopax minor | 1 | 0 | 1 |
| Wood Duck Aix sponsa | Gadwall Mareca strepera | 1 | 1 | 0 |
| Wood Duck Aix sponsa | American Black Duck Anas rubripes | 1 | 0 | 1 |
| Wood Duck Aix sponsa | Eurasian/Green-winged Teal Anas crecca | 1 | 0 | 1 |
| Wood Duck Aix sponsa | Surf Scoter Melanitta perspicillata | 1 | 0 | 1 |
| Wood Duck Aix sponsa | White-winged Scoter Melanitta deglandi | 1 | 1 | 0 |
| Wood Duck Aix sponsa | Long-tailed Duck Clangula hyemalis | 1 | 0 | 1 |
| Blue-winged Teal Spatula discors | Mallard Anas platyrhynchos | 1 | 1 | 0 |
| Blue-winged Teal Spatula discors | Greater Scaup Aythya marila | 1 | 0 | 1 |
| Blue-winged Teal Spatula discors | Lesser Scaup Aythya affinis | 1 | 1 | 0 |
| Blue-winged Teal Spatula discors | Harlequin Duck Histrionicus histrionicus | 1 | 0 | 1 |
| Blue-winged Teal Spatula discors | Barrow's Goldeneye Bucephala islandica | 1 | 0 | 1 |
| Cinnamon Teal Spatula cyanoptera | Eurasian Wigeon Mareca penelope | 1 | 1 | 0 |
| Northern Shoveler Spatula clypeata | Mallard Anas platyrhynchos | 1 | 1 | 0 |
| Northern Shoveler Spatula clypeata | Harlequin Duck Histrionicus histrionicus | 1 | 0 | 1 |
| Northern Shoveler Spatula clypeata | White-winged Scoter Melanitta deglandi | 1 | 0 | 1 |
| Northern Shoveler Spatula clypeata | Goosander Mergus merganser | 1 | 0 | 1 |
| Gadwall Mareca strepera | Surf Scoter Melanitta perspicillata | 1 | 1 | 0 |
| Gadwall Mareca strepera | Common Goldeneye Bucephala clangula | 1 | 0 | 1 |
| American Wigeon Mareca americana | Black Scoter Melanitta americana | 1 | 1 | 0 |
| American Wigeon Mareca americana | Long-tailed Duck Clangula hyemalis | 1 | 0 | 1 |
| American Wigeon Mareca americana | Ruddy Duck Oxyura jamaicensis | 1 | 1 | 0 |
| Mallard Anas platyrhynchos | Northern Pintail Anas acuta | 1 | 0 | 1 |
| Mallard Anas platyrhynchos | Canvasback Aythya valisineria | 1 | 0 | 1 |
| Mallard Anas platyrhynchos | King Eider Somateria spectabilis | 1 | 0 | 1 |
| Mallard Anas platyrhynchos | Harlequin Duck Histrionicus histrionicus | 1 | 0 | 1 |
| American Black Duck Anas rubripes | Canvasback Aythya valisineria | 1 | 1 | 0 |
| American Black Duck Anas rubripes | Lesser Scaup Aythya affinis | 1 | 1 | 0 |
| American Black Duck Anas rubripes | Goosander Mergus merganser | 1 | 0 | 1 |
| Northern Pintail Anas acuta | King Eider Somateria spectabilis | 1 | 0 | 1 |
| Northern Pintail Anas acuta | Surf Scoter Melanitta perspicillata | 1 | 1 | 0 |
| Northern Pintail Anas acuta | Barrow's Goldeneye Bucephala islandica | 1 | 1 | 0 |
| Northern Pintail Anas acuta | Ruddy Duck Oxyura jamaicensis | 1 | 1 | 0 |
| Eurasian/Green-winged Teal Anas crecca | Canvasback Aythya valisineria | 1 | 1 | 0 |
| Eurasian/Green-winged Teal Anas crecca | Redhead Aythya americana | 1 | 1 | 0 |
| Eurasian/Green-winged Teal Anas crecca | Ring-necked Duck Aythya collaris | 1 | 1 | 0 |
| Eurasian/Green-winged Teal Anas crecca | Black Scoter Melanitta americana | 1 | 0 | 1 |
| Eurasian/Green-winged Teal Anas crecca | Long-tailed Duck Clangula hyemalis | 1 | 0 | 1 |
| Eurasian/Green-winged Teal Anas crecca | Ruddy Duck Oxyura jamaicensis | 1 | 0 | 1 |
| Canvasback Aythya valisineria | Red-breasted Merganser Mergus serrator | 1 | 1 | 0 |
| Redhead Aythya americana | Long-tailed Duck Clangula hyemalis | 1 | 1 | 0 |
| Redhead Aythya americana | Barrow's Goldeneye Bucephala islandica | 1 | 1 | 0 |
| Redhead Aythya americana | Red-breasted Merganser Mergus serrator | 1 | 1 | 0 |
| Ring-necked Duck Aythya collaris | King Eider Somateria spectabilis | 1 | 1 | 0 |
| Tufted Duck Aythya fuligula | Greater Scaup Aythya marila | 1 | 0 | 1 |
| Greater Scaup Aythya marila | King Eider Somateria spectabilis | 1 | 1 | 0 |
| Greater Scaup Aythya marila | Common Eider Somateria mollissima | 1 | 1 | 0 |
| Greater Scaup Aythya marila | Ruddy Duck Oxyura jamaicensis | 1 | 1 | 0 |
| Lesser Scaup Aythya affinis | Ruddy Duck Oxyura jamaicensis | 1 | 0 | 1 |
| Black Scoter Melanitta americana | Common Goldeneye Bucephala clangula | 1 | 1 | 0 |
| Common Goldeneye Bucephala clangula | Ruddy Duck Oxyura jamaicensis | 1 | 0 | 1 |
| Red-breasted Merganser Mergus serrator | Northern Parula Setophaga americana | 1 | 1 | 0 |
| Helmeted Guineafowl Numida meleagris | Rock Ptarmigan Lagopus muta | 1 | 1 | 0 |
| Sharp-tailed Grouse Tympanuchus phasianellus | Willow Ptarmigan Lagopus lagopus | 1 | 0 | 1 |
| Sharp-tailed Grouse Tympanuchus phasianellus | Red-legged Partridge Alectoris rufa | 1 | 0 | 1 |
| Sharp-tailed Grouse Tympanuchus phasianellus | Harris's Sparrow Zonotrichia querula | 1 | 0 | 1 |
| White-tailed Ptarmigan Lagopus leucura | Rock Ptarmigan Lagopus muta | 1 | 1 | 0 |
| Spruce Grouse Canachites canadensis | Red Junglefowl Gallus gallus | 1 | 0 | 1 |
| Red Junglefowl Gallus gallus | Red-naped Sapsucker Sphyrapicus nuchalis | 1 | 1 | 0 |
| Red-legged Partridge Alectoris rufa | Evening Grosbeak Hesperiphona vespertina | 1 | 0 | 1 |
| Common Nighthawk Chordeiles minor | Black Swift Cypseloides niger | 1 | 0 | 1 |
| Common Nighthawk Chordeiles minor | Black-capped Chickadee Poecile atricapillus | 1 | 1 | 0 |
| Vaux's Swift Chaetura vauxi | Least Sandpiper Calidris minutilla | 1 | 1 | 0 |
| Sora Porzana carolina | Yellow Rail Coturnicops noveboracensis | 1 | 0 | 1 |
| Black-necked Stilt Himantopus mexicanus | Grey Plover Pluvialis squatarola | 1 | 1 | 0 |
| American Avocet Recurvirostra americana | Marbled Godwit Limosa fedoa | 1 | 0 | 1 |
| American Golden Plover Pluvialis dominica | Long-billed Dowitcher Limnodromus scolopaceus | 1 | 0 | 1 |
| Killdeer Charadrius vociferus | Short-billed Dowitcher Limnodromus griseus | 1 | 1 | 0 |
| Killdeer Charadrius vociferus | Wilson's Snipe Gallinago delicata | 1 | 0 | 1 |
| Upland Sandpiper Bartramia longicauda | Ruff Calidris pugnax | 1 | 0 | 1 |
| Long-billed Curlew Numenius americanus | Greater Yellowlegs Tringa melanoleuca | 1 | 0 | 1 |
| Long-billed Curlew Numenius americanus | Ruddy Turnstone Arenaria interpres | 1 | 0 | 1 |
| Hudsonian Godwit Limosa haemastica | Grey Phalarope Phalaropus fulicarius | 1 | 0 | 1 |
| Hudsonian Godwit Limosa haemastica | Willet Tringa semipalmata | 1 | 0 | 1 |
| Marbled Godwit Limosa fedoa | Long-billed Dowitcher Limnodromus scolopaceus | 1 | 1 | 0 |
| Marbled Godwit Limosa fedoa | White-rumped Sandpiper Calidris fuscicollis | 1 | 0 | 1 |
| Long-billed Dowitcher Limnodromus scolopaceus | Wilson's Snipe Gallinago delicata | 1 | 1 | 0 |
| American Woodcock Scolopax minor | Grey Phalarope Phalaropus fulicarius | 1 | 0 | 1 |
| Grey Phalarope Phalaropus fulicarius | Western Sandpiper Calidris mauri | 1 | 0 | 1 |
| Red-necked Phalarope Phalaropus lobatus | Rose-breasted Grosbeak Pheucticus ludovicianus | 1 | 1 | 0 |
| Spotted Sandpiper Actitis macularius | Solitary Sandpiper Tringa solitaria | 1 | 0 | 1 |
| Ruff Calidris pugnax | Curlew Sandpiper Calidris ferruginea | 1 | 0 | 1 |
| Stilt Sandpiper Calidris himantopus | Sanderling Calidris alba | 1 | 0 | 1 |
| Sanderling Calidris alba | Dunlin Calidris alpina | 1 | 1 | 0 |