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Mallard x Mottled Duck (hybrid)
Muscovy Duck x Mallard (hybrid)
Blue-winged Teal x Northern Shoveler (hybrid)
Herring x Glaucous Gull (hybrid)
Graylag x Swan Goose (hybrid)
Blue-winged x Cinnamon Teal (hybrid)
Swan Goose x Canada Goose (hybrid)
Domestic goose sp. x Canada Goose (hybrid)
Mallard x American Black Duck (hybrid)
Snow x Ross's Goose (hybrid)
Glossy x White-faced Ibis (hybrid)
Brewster's Warbler (hybrid)
Lawrence's Warbler (hybrid)
Golden-winged x Blue-winged Warbler (hybrid)
Bahama x Northern Mockingbird (hybrid)
Great Egret x Great Blue Heron (hybrid)
Tropical x Northern Mockingbird (hybrid)
Herring x Lesser Black-backed Gull (hybrid)
Double-crested x Neotropic Cormorant (hybrid)
Canvasback x Redhead (hybrid)
Ring-necked Duck x Lesser Scaup (hybrid)
Mallard x Northern Pintail (hybrid)
Mallard x Ring-necked Duck (hybrid)
Herring x Great Black-backed Gull (hybrid)
Barnacle x Canada Goose (hybrid)
White x Scarlet Ibis (hybrid)
Tropical x Gray Kingbird (hybrid)
Little Blue Heron x Snowy Egret (hybrid)
Buff-breasted x White-rumped Sandpiper (hybrid)
Graylag x Canada Goose (hybrid)
Snowy x Little Egret (hybrid)
Little Blue x Tricolored Heron (hybrid)
Indigo x Painted Bunting (hybrid)
Blue-and-yellow x Scarlet Macaw (hybrid)
Blue-winged x Green-winged Teal (hybrid)
Redhead x Lesser Scaup (hybrid)
Yellow x Prairie Warbler (hybrid)
Tricolored Heron x Snowy Egret (hybrid)
Mallard x Eastern Spot-billed Duck (hybrid)
Clay-colored x Field Sparrow (hybrid)
Redhead x Ring-necked Duck (hybrid)
Trumpeter x Tundra Swan (hybrid)
Crimson x Eastern Rosella (hybrid)
House x Fish Crow (hybrid)
Magnolia x Palm Warbler (hybrid)
Cerulean Warbler x Northern Parula (hybrid)
Redhead x scaup sp. (hybrid)
Sandwich x Elegant Tern (hybrid)
Eurasian x American Wigeon (hybrid)
Lazuli x Indigo Bunting (hybrid)
Dunlin x White-rumped Sandpiper (hybrid)
Cliff x Cave Swallow (hybrid)
Eurasian Collared-Dove x Mourning Dove (hybrid)
American Wigeon x Mallard (hybrid)
Yellow-bellied x Red-naped Sapsucker (hybrid)
White-winged x Yellow-chevroned Parakeet (hybrid)
Laughing x Ring-billed Gull (hybrid)
Northern Shoveler x Mallard (hybrid)
Bullock's x Baltimore Oriole (hybrid)
American Wigeon x Northern Pintail (hybrid)
Scaled x Gambel's Quail (hybrid)
shorebird sp.
passerine sp.
Short-billed/Long-billed Dowitcher
Lesser/Greater Yellowlegs
Sharp-shinned/Cooper's Hawk
Louisiana/Northern Waterthrush
Amazona sp.
Mitred/Red-masked Parakeet
Domestic goose sp. (Domestic type)
Double-crested/Neotropic Cormorant
parakeet sp.
Western/Semipalmated Sandpiper
small falcon sp.
Parasitic/Pomarine Jaeger
Psittacara sp.
yellow-bellied kingbird sp.
Eurasian Moorhen/Common Gallinule
Yellow-crowned/Black-crowned Night Heron
waterfowl sp.
Nelson's/Saltmarsh Sparrow (Sharp-tailed Sparrow)
Passerina sp.
Western/Eastern Cattle Egret
large parakeet sp. (former Aratinga sp.)
White-winged/Yellow-chevroned Parakeet
diurnal raptor sp.
Common/Red-breasted Merganser
parrot sp.
Surf/Black Scoter
new world oriole sp.
Ruby-throated/Black-chinned Hummingbird
Cassin's/Blue-headed Vireo
American Black/Mottled Duck
shearwater sp.
Herring/Lesser Black-backed Gull
Sooty/Bridled Tern
rail/crake sp.
Selasphorus sp.
Ammospiza sp.
Western/Eastern Meadowlark
Anas sp.
American/Greater Flamingo
merganser sp.
Mallard/American Black Duck
Setophaga sp.
Rufous/Allen's Hummingbird
Podiceps sp.
tanager sp. (Piranga sp.)
Horned/Eared Grebe
Tropical/Couch's Kingbird
moorhen/coot/gallinule sp.
Western/Clark's Grebe
Sedge/Marsh Wren
Blue-winged/Cinnamon Teal
Cliff/Cave Swallow
Scolopacidae sp.
Tyrannus sp.
Yellow-billed/Black-billed Cuckoo
Common/Spotted Sandpiper
Bay-breasted/Blackpoll Warbler
Cassin's/Western Kingbird
cuckoo sp. (Cuculidae sp.)
Alder/Willow Flycatcher (Traill's Flycatcher)
Philadelphia/Warbling Vireo
Shiny/Brown-headed Cowbird
Bronzed/Brown-headed Cowbird
Coccyzus sp.
Gray-cheeked/Bicknell's Thrush
Red/Red-necked Phalarope
mimid sp.
Western/Eastern Wood-Pewee
phalarope sp.
Golden-winged/Blue-winged Warbler
new world martin sp. (Progne sp.)
Summer/Scarlet Tanager
Black-bellied Plover/golden-plover sp.
storm-petrel sp.
flamingo sp.
Long-tailed/Parasitic Jaeger
Smooth-billed/Groove-billed Ani
storm-petrel sp. (white-rumped)
nightjar sp.
Common/Antillean Nighthawk
vireo sp. (Red-eyed Vireo complex)
Philadelphia/Red-eyed Vireo
Red-eyed/Black-whiskered Vireo
Laughing/Franklin's Gull
Spotted/Eastern Towhee (Rufous-sided Towhee)
lovebird sp.
tropicbird sp.
Carolina/Black-capped Chickadee
Lazuli/Indigo Bunting
black-and-white shearwater sp.
Brotogeris sp.
Ring-necked/Green Pheasant
Common/Black Scoter
House/Purple Finch
Hepatic/Summer Tanager
Lincoln's/Swamp Sparrow
Antrostomus sp.
Snow/Ross's Goose
pewee sp. (Contopus sp.)
Leiothlypis sp.
Connecticut/MacGillivray's/Mourning Warbler
White-crowned/White-throated Sparrow
corella/white cockatoo sp.
Common/Arctic Tern
American/Pacific Golden-Plover (Lesser Golden-Plover)
Scarlet-fronted/Cordilleran Parakeet
Tundra/Whooper Swan
Pterodroma sp.
yellowthroat sp.
golden-plover sp.
Tree/Violet-green Swallow
large macaw sp.
Chimney/Vaux's Swift
Chaetura sp.
small swift sp.
Rose-breasted/Black-headed Grosbeak
Grasshopper/Henslow's Sparrow
swamphen sp.
Zonotrichia sp.
Patagioenas sp.
Red-shouldered/Broad-winged Hawk
Gray-tailed/Wandering Tattler
Pheucticus sp.
white-winged gull sp.
Bullock's/Baltimore Oriole
solitary vireo sp.
elaenia sp. (genus Elaenia)
Cory's/Cape Verde Shearwater
storm-petrel sp. (dark-rumped)
Common Ringed/Semipalmated Plover
nuthatch sp.
Petrochelidon sp.
Sharp-tailed/Pectoral Sandpiper
myna/starling sp.
Golden/Bald Eagle
Streptopelia sp.
Anser sp.
gnatcatcher sp.
Tropical/Northern Mockingbird
Rusty/Brewer's Blackbird
Elegant/Royal Tern
Cathartes sp.
Cackling/Canada Goose
large alcid sp.
Dryobates sp.
Golden-fronted/Red-bellied Woodpecker
Brown/Black Noddy
skua sp.
MacGillivray's/Mourning Warbler
Eurasian/African Collared-Dove
Trumpeter/Tundra Swan
procellariid sp.
Boat-tailed/Great-tailed Grackle
Euplectes sp.
Shiny/Bronzed Cowbird
albatross sp.
Streaked/Sulphur-bellied Flycatcher
rainbow lorikeet sp.
Ruby-crowned/Golden-crowned Kinglet
Red-eyed/Yellow-green Vireo
Great/Double-crested Cormorant