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Tufted x Black-crested Titmouse (hybrid)
Muscovy Duck x Mallard (hybrid)
Mallard x Mexican Duck (hybrid)
Graylag x Swan Goose (hybrid)
Mallard x Mottled Duck (hybrid)
Mexican x Mottled Duck (hybrid)
Blue-winged x Cinnamon Teal (hybrid)
Glossy x White-faced Ibis (hybrid)
Altamira x Audubon's Oriole (hybrid)
American Wigeon x Mallard (hybrid)
Northern Shoveler x Gadwall (hybrid)
Spotted x Eastern Towhee (hybrid)
Mallard x Northern Pintail (hybrid)
Northern x Tropical Parula (hybrid)
Cinnamon x Green-winged Teal (hybrid)
Redhead x Ring-necked Duck (hybrid)
Blue-winged x Green-winged Teal (hybrid)
Red-naped x Red-breasted Sapsucker (hybrid)
Snow x Greater White-fronted Goose (hybrid)
Gadwall x Mallard (hybrid)
Golden-fronted x Red-bellied Woodpecker (hybrid)
Yellow-bellied x Red-naped Sapsucker (hybrid)
Snow x Canada Goose (hybrid)
Snow x Cackling Goose (hybrid)
Domestic goose sp. x Canada Goose (hybrid)
Red-crowned x Red-lored Parrot (hybrid)
Gadwall x American Wigeon (hybrid)
Snow/Ross's x Cackling/Canada Goose (hybrid)
Red-crowned x Lilac-crowned Parrot (hybrid)
Snow x Ross's Goose (hybrid)
Western x Clark's Grebe (hybrid)
Greater White-fronted x Canada Goose (hybrid)
Ring-necked Duck x Lesser Scaup (hybrid)
Ross's x Cackling Goose (hybrid)
Double-crested x Neotropic Cormorant (hybrid)
Bullock's x Baltimore Oriole (hybrid)
Ruby-throated x Black-chinned Hummingbird (hybrid)
Graylag x Canada Goose (hybrid)
Northern Cardinal x Pyrrhuloxia (hybrid)
Barn x Cliff Swallow (hybrid)
Barn x Cave Swallow (hybrid)
Lucifer x Black-chinned Hummingbird (hybrid)
Colima x Virginia's Warbler (hybrid)
Downy x Ladder-backed Woodpecker (hybrid)
Lazuli x Indigo Bunting (hybrid)
Golden-winged x Blue-winged Warbler (hybrid)
Black-capped x White-eyed Vireo (hybrid)
Brewster's Warbler (hybrid)
Cape May x Magnolia Warbler (hybrid)
Lawrence's Warbler (hybrid)
Herring x Glaucous Gull (hybrid)
Little Blue Heron x Snowy Egret (hybrid)
Blue-winged Teal x Northern Shoveler (hybrid)
White-crowned x Harris's Sparrow (hybrid)
Mallard x Mexican/Mottled Duck (hybrid)
Common x Great-tailed Grackle (hybrid)
Swan Goose x Canada Goose (hybrid)
Redhead x scaup sp. (hybrid)
Black-bellied x Fulvous Whistling-Duck (hybrid)
Greater White-fronted x Cackling Goose (hybrid)
Mallard x Green-winged Teal (hybrid)
Gadwall x Northern Pintail (hybrid)
Dark-eyed Junco x White-throated Sparrow (hybrid)
Couch's Kingbird x Scissor-tailed Flycatcher (hybrid)
Rose-breasted x Black-headed Grosbeak (hybrid)
Scaled x Gambel's Quail (hybrid)
Townsend's x Hermit Warbler (hybrid)
Varied x Painted Bunting (hybrid)
Curve-billed x Long-billed Thrasher (hybrid)
Cinnamon Teal x Northern Shoveler (hybrid)
Canvasback x Redhead (hybrid)
Northern Shoveler x Mallard (hybrid)
MacGillivray's x Mourning Warbler (hybrid)
Black-chinned x Anna's Hummingbird (hybrid)
Herring x Lesser Black-backed Gull (hybrid)
Black x Eastern Phoebe (hybrid)
Anna's x Calliope Hummingbird (hybrid)
Ring-necked Duck x Greater Scaup (hybrid)
Anna's Hummingbird x Selasphorus sp. (hybrid)
Anna's x Rufous Hummingbird (hybrid)
Tricolored Heron x Snowy Egret (hybrid)
King x Clapper Rail (hybrid)
Western x Eastern Kingbird (hybrid)
Northern Parula x Yellow-throated Warbler (hybrid)
Mallard x American Black Duck (hybrid)
Herring x Glaucous-winged Gull (hybrid)
Eurasian x American Wigeon (hybrid)
Costa's x Broad-billed Hummingbird (hybrid)
Ross's x Canada Goose (hybrid)
Northern Shoveler x American Wigeon (hybrid)
Ring-necked Duck x scaup sp. (hybrid)
Northern Pintail x Green-winged Teal (hybrid)
Northern Bobwhite x Scaled Quail (hybrid)
Barnacle x Canada Goose (hybrid)
Western Kingbird x Scissor-tailed Flycatcher (hybrid)
Anna's x Allen's Hummingbird (hybrid)
Townsend's x Black-throated Green Warbler (hybrid)
Western x Flame-colored Tanager (hybrid)
Tropical x Northern Mockingbird (hybrid)
Glaucous-winged x Slaty-backed Gull (hybrid)
American Wigeon x Northern Pintail (hybrid)
Indigo x Painted Bunting (hybrid)
Common Yellowthroat x Rufous-capped Warbler (hybrid)
Grace's x Black-throated Gray Warbler (hybrid)
Gray-crowned x Common Yellowthroat (hybrid)
Herring x Great Black-backed Gull (hybrid)
Kelp x Herring Gull (hybrid)
Western x Glaucous-winged Gull (hybrid)
Sandhill x Whooping Crane (hybrid)
Swainson's x Rough-legged Hawk (hybrid)
Wood Duck x Mallard (hybrid)
Western/Eastern Meadowlark
new world warbler sp.
Louisiana/Northern Waterthrush
Tufted/Black-crested Titmouse
Domestic goose sp. (Domestic type)
Double-crested/Neotropic Cormorant
Short-billed/Long-billed Dowitcher
hummingbird sp.
Cliff/Cave Swallow
Rufous/Allen's Hummingbird
Boat-tailed/Great-tailed Grackle
Tropical/Couch's Kingbird
Ruby-throated/Black-chinned Hummingbird
Western/Semipalmated Sandpiper
Brown/Long-billed Thrasher
Bronzed/Brown-headed Cowbird
new world vulture sp.
Downy/Ladder-backed Woodpecker
Lesser/Greater Yellowlegs
Northern Cardinal/Pyrrhuloxia
Yellow-crowned/Black-crowned Night Heron
Blue-winged/Cinnamon Teal
new world flycatcher sp.
Accipiter sp.
Black-bellied Plover/golden-plover sp.
Sharp-shinned/Cooper's Hawk
Amazona sp.
Western/Chihuahuan Meadowlark
yellow-bellied kingbird sp.
Spizella sp.
Spotted/Eastern Towhee (Rufous-sided Towhee)
Golden-fronted/Red-bellied Woodpecker
Sturnella meadowlark sp.
King/Clapper Rail
Myiarchus sp.
Eurasian/African Collared-Dove
Yellow-bellied/Red-naped Sapsucker
nighthawk sp.
parrot sp.
parakeet sp.
rail/crake sp.
Common/Red-breasted Merganser
Golden/Bald Eagle
Masked/Ruddy Duck
Rose-breasted/Black-headed Grosbeak
moorhen/coot/gallinule sp.
Setophaga sp.
scoter sp.
sapsucker sp.
Western/Eastern Cattle Egret
Cassin's/Blue-headed Vireo
Lincoln's/Swamp Sparrow
Loggerhead/Northern Shrike
Red-crowned/Lilac-crowned Parrot
Rusty/Brewer's Blackbird
tanager sp. (Piranga sp.)
Botteri's/Cassin's Sparrow
Herring/Iceland Gull
shearwater sp.
new world martin sp. (Progne sp.)
Laughing/Franklin's Gull
phalarope sp.
Ruby-crowned/Golden-crowned Kinglet
crow/raven sp.
new world quail sp.
Ammospiza sp.
Alder/Willow Flycatcher (Traill's Flycatcher)
Pacific/Winter Wren
Clay-colored/Brewer's Sparrow
Common/Arctic Tern
waterfowl sp.
MacGillivray's/Mourning Warbler
Eastern/Chihuahuan Meadowlark
Golden-winged/Blue-winged Warbler
Passer sp.
nightjar sp.
Yellow-billed/Black-billed Cuckoo
Red-shouldered/Broad-winged Hawk
Philadelphia/Warbling Vireo
Cassin's/Western Kingbird
Western/Eastern Wood-Pewee
American/Pacific Golden-Plover (Lesser Golden-Plover)
Gray/Dusky Flycatcher
black-and-white shearwater sp.
Bullock's/Baltimore Oriole
Hammond's/Dusky Flycatcher
storm-petrel sp. (white-rumped)
Red-eyed/Yellow-green Vireo
quail-dove sp.
vireo sp. (Red-eyed Vireo complex)
Philadelphia/Red-eyed Vireo
American/Fish Crow
cuckoo sp. (Cuculidae sp.)
Bay-breasted/Blackpoll Warbler
Antrostomus sp.
Summer/Scarlet Tanager
Hudsonian/Marbled Godwit
white-winged gull sp.
Tree/Violet-green Swallow
Tachycineta sp.
Parasitic/Pomarine Jaeger
Long-tailed/Parasitic Jaeger
Grasshopper/Baird's Sparrow
merganser sp.
Spizella sp./American Tree Sparrow
White-crowned/White-throated Sparrow
Smooth-billed/Groove-billed Ani
Psittacara sp.
storm-petrel sp.
Connecticut/MacGillivray's/Mourning Warbler
Elegant/Royal Tern
Eastern/Mexican Whip-poor-will
Chimney/Vaux's Swift
Scolopacidae sp.
Herring/Glaucous-winged Gull
Aphelocoma sp.
Shiny/Bronzed Cowbird
golden-plover sp.
Carolina/Black-capped Chickadee
Red/Red-necked Phalarope
King/Virginia Rail
large macaw sp.
lovebird sp.
Hydrobates sp. (Band-rumped complex)
screech-owl sp.
Herring/Lesser Black-backed Gull
Red-eyed/Chivi Vireo
Purple/Cassin's Finch
Long-eared/Short-eared Owl
White-winged/Stejneger's Scoter
large swift sp.
coot sp.
nuthatch sp.
Coccyzus sp.
chickadee sp.
eclectus sp.
Pheucticus sp.
Petrochelidon sp.
large rail sp.
Bohemian/Cedar Waxwing
Cooper's Hawk/American Goshawk
Buteo/eagle sp.
Hepatic/Summer Tanager
waxbill sp.
Sooty/Bridled Tern
Cathartes sp.
American/Black Oystercatcher
crossbill sp.
Great/Double-crested Cormorant
White-winged/Yellow-chevroned Parakeet
Anna's/Costa's Hummingbird
Trumpeter/Tundra Swan
California/Woodhouse's Scrub-Jay
Psittacula sp.
yellowthroat sp.
Common/Barrow's Goldeneye
Mississippi/Plumbeous Kite
Grasshopper/Henslow's Sparrow
Geranoaetus/Buteo sp.
Common/Wilson's Snipe
Hydrobates sp.
Common/Yellow-billed Loon
Brown/Black Noddy
American/Greater Flamingo
flamingo sp.
Nelson's/Saltmarsh Sparrow (Sharp-tailed Sparrow)
Mallard/American Black Duck
Morelet's/Cinnamon-rumped Seedeater
large parakeet sp. (former Aratinga sp.)
Common/Ruddy Ground Dove
Oak/Juniper Titmouse (Plain Titmouse)
Eurasian/American Wigeon
stilt/avocet sp.
Greater/Lesser Prairie-Chicken
frigatebird sp.