Family Gaviidae:
Arctic Loon (Gavia arctica)
Common Loon (Gavia immer)
Family Podicipedidae:
Western Grebe (Aechmophorus occidentalis)
Horned Grebe (Podiceps auritus)
Red-necked Grebe (Podiceps grisegena)
Eared Grebe (Podiceps nigricollis)
Pied-billed Grebe (Podilymbus podiceps)
Family Pelecanidae:
American White Pelican (Pelecanus erythrorhynchos)
Family Ardeidae:
Great Blue Heron (Ardea herodias)
American Bittern (Botaurus lentiginosus)
Green-backed Heron (Butorides striatus)
Snowy Egret (Egretta thula)
Least Bittern (Ixobrychus exilis)
Black-crowned Night-Heron (Nycticorax nycticorax)
Family Threskiornithidae:
White-faced Ibis (Plegadis chihi)
Family Anatidae:
Wood Duck (Aix sponsa)
Northern Pintail (Anas acuta)
American Wigeon (Anas americana)
Northern Shoveler (Anas clypeata)
Green-winged Teal (Anas crecca)
Cinnamon Teal (Anas cyanoptera)
Blue-winged Teal (Anas discors)
Mallard (Anas platyrhynchos)
Gadwall (Anas strepera)
Greater White-fronted Goose (Anser albifrons)
Lesser Scaup (Aythya affinis)
Redhead (Aythya americana)
Ring-necked Duck (Aythya collaris)
Canvasback (Aythya valisineria)
Canada Goose (Branta canadensis)
Bufflehead (Bucephala albeola)
Common Goldeneye (Bucephala clangula)
Barrow's Goldeneye (Bucephala islandica)
Snow Goose (Chen caerulescens)
Oldsquaw (Clangula hyemalis)
Tundra Swan (Cygnus columbianus)
Hooded Merganser (Lophodytes cucullatus)
White-winged Scoter (Melanitta fusca)
Common Merganser (Mergus merganser)
Red-breasted Merganser (Mergus serrator)
Ruddy Duck (Oxyura jamaicensis)
Family Cathartidae:
Turkey Vulture (Cathartes aura)
Family Accipitridae:
Osprey (Pandion haliaetus)
Cooper's Hawk (Accipiter cooperii)
Northern Goshawk (Accipiter gentilis)
Sharp-shinned Hawk (Accipiter striatus)
Golden Eagle (Aquila chrysaetos)
Red-tailed Hawk (Buteo jamaicensis)
Rough-legged Hawk (Buteo lagopus)
Ferruginous Hawk (Buteo regalis)
Swainson's Hawk (Buteo swainsoni)
Northern Harrier (Circus cyaneus)
Bald Eagle (Haliaeetus leucocephalus)
Family Falconidae:
Merlin (Falco columbarius)
Prairie Falcon (Falco mexicanus)
Peregrine Falcon (Falco peregrinus)
American Kestrel (Falco sparverius)
Family Phasianidae:
Ring-necked Pheasant (Phasianus colchicus)
Sage Grouse (Centrocercus urophasianus)
Blue Grouse (Dendragapus obscurus)
White-tailed Ptarmigan (Lagopus leucurus)
Wild Turkey (Meleagris gallopavo)
Northern Bobwhite (Colinus virginianus)
Family Rallidae:
American Coot (Fulica americana)
Common Moorhen (Gallinula chloropus)
Sora (Porzana carolina)
Virginia Rail (Rallus limicola)
Family Gruidae:
Sandhill Crane (Grus canadensis)
Family Charadriidae:
Semipalmated Plover (Charadrius semipalmatus)
Killdeer (Charadrius vociferus)
Family Recurvirostridae:
American Avocet (Recurvirostra americana)
Family Scolopacidae:
Spotted Sandpiper (Actitis macularia)
Baird's Sandpiper (Calidris bairdii)
Western Sandpiper (Calidris mauri)
Least Sandpiper (Calidris minutilla)
Willet (Catoptrophorus semipalmatus)
Common Snipe (Gallinago gallinago)
Marbled Godwit (Limosa fedoa)
Long-billed Curlew (Numenius americanus)
Lesser Yellowlegs (Tringa flavipes)
Greater Yellowlegs (Tringa melanoleuca)
Solitary Sandpiper (Tringa solitaria)
Red-necked Phalarope (Phalaropus lobatus)
Wilson's Phalarope (Phalaropus tricolor)
Family Laridae:
Pomarine Jaeger (Stercorarius pomarinus)
Herring Gull (Larus argentatus)
California Gull (Larus californicus)
Ring-billed Gull (Larus delawarensis)
Bonaparte's Gull (Larus philadelphia)
Franklin's Gull (Larus pipixcan)
Black Tern (Chlidonias niger)
Forster's Tern (Sterna forsteri)
Family Columbidae:
Band-tailed Pigeon (Columba fasciata)
Rock Dove (Columba livia)
Mourning Dove (Zenaida macroura)
Family Cuculidae:
Yellow-billed Cuckoo (Coccyzus americanus)
Family Strigidae:
Northern Saw-whet Owl (Aegolius acadicus)
Boreal Owl (Aegolius funereus)
Long-eared Owl (Asio otus)
Great Horned Owl (Bubo virginianus)
Northern Pygmy-Owl (Glaucidium gnoma)
Eastern Screech-Owl (Otus asio)
Western Screech-Owl (Otus kennicottii)
Flammulated Owl (Otus flammeolus)
Family Caprimulgidae:
Common Nighthawk (Chordeiles minor)
Common Poorwill (Phalaenoptilus nuttallii)
Family Apodidae:
White-throated Swift (Aeronautes saxatalis)
Chimney Swift (Chaetura pelagica)
Black Swift (Cypseloides niger)
Family Trochilidae:
Magnificent Hummingbird (Eugenes fulgens)
Broad-tailed Hummingbird (Selasphorus platycercus)
Rufous Hummingbird (Selasphorus rufus)
Calliope Hummingbird (Stellula calliope)
Family Alcedinidae:
Belted Kingfisher (Ceryle alcyon)
Family Picidae:
Northern Flicker (Colaptes auratus)
Red-headed Woodpecker (Melanerpes erythrocephalus)
Lewis' Woodpecker (Melanerpes lewis)
Downy Woodpecker (Picoides pubescens)
Three-toed Woodpecker (Picoides tridactylus)
Hairy Woodpecker (Picoides villosus)
Williamson's Sapsucker (Sphyrapicus thyroideus)
Yellow-bellied Sapsucker (Sphyrapicus varius)
Family Tyrannidae:
Olive-sided Flycatcher (Contopus borealis)
Western Wood-Pewee (Contopus sordidulus)
Pacific-slope Flycatcher (Empidonax difficilis)
Hammond's Flycatcher (Empidonax hammondii)
Least Flycatcher (Empidonax minimus)
Dusky Flycatcher (Empidonax oberholseri)
Willow Flycatcher (Empidonax traillii)
Say's Phoebe (Sayornis saya)
Ash-throated Flycatcher (Myiarchus cinerascens)
Eastern Kingbird (Tyrannus tyrannus)
Western Kingbird (Tyrannus verticalis)
Cassin's Kingbird (Tyrannus vociferans)
Family Alaudidae:
Horned Lark (Eremophila alpestris)
Family Hirundinidae:
Cliff Swallow (Hirundo pyrrhonota)
Barn Swallow (Hirundo rustica)
Purple Martin (Progne subis)
Northern Rough-winged Swallow (Stelgidopteryx serripennis)
Tree Swallow (Tachycineta bicolor)
Violet-green Swallow (Tachycineta thalassina)
Family Corvidae:
Scrub Jay (Aphelocoma coerulescens)
American Crow (Corvus brachyrhynchos)
Common Raven (Corvus corax)
Blue Jay (Cyanocitta cristata)
Steller's Jay (Cyanocitta stelleri)
Pinyon Jay (Gymnorhinus cyanocephalus)
Clark's Nutcracker (Nucifraga columbiana)
Gray Jay (Perisoreus canadensis)
Black-billed Magpie (Pica pica)
Family Paridae:
Black-capped Chickadee (Parus atricapillus)
Mountain Chickadee (Parus gambeli)
Family Sittidae:
Red-breasted Nuthatch (Sitta canadensis)
White-breasted Nuthatch (Sitta carolinensis)
Pygmy Nuthatch (Sitta pygmaea)
Family Certhiidae:
Brown Creeper (Certhia americana)
Family Troglodytidae:
Canyon Wren (Catherpes mexicanus)
Rock Wren (Salpinctes obsoletus)
Bewick's Wren (Thryomanes bewickii)
House Wren (Troglodytes aedon)
Winter Wren (Troglodytes troglodytes)
Family Cinclidae:
American Dipper (Cinclus mexicanus)
Family Muscicapidae:
Blue-gray Gnatcatcher (Polioptila caerulea)
Ruby-crowned Kinglet (Regulus calendula)
Golden-crowned Kinglet (Regulus satrapa)
Veery (Catharus fuscescens)
Hermit Thrush (Catharus guttatus)
Swainson's Thrush (Catharus ustulatus)
Varied Thrush (Ixoreus naevius)
Townsend's Solitaire (Myadestes townsendi)
Mountain Bluebird (Sialia currucoides)
Western Bluebird (Sialia mexicana)
Eastern Bluebird (Sialia sialis)
American Robin (Turdus migratorius)
Family Mimidae:
Gray Catbird (Dumetella carolinensis)
Northern Mockingbird (Mimus polyglottos)
Sage Thrasher (Oreoscoptes montanus)
Brown Thrasher (Toxostoma rufum)
Family Motacillidae:
American Pipit (Anthus rubescens)
Sprague's Pipit (Anthus spragueii)
Family Bombycillidae:
Cedar Waxwing (Bombycilla cedrorum)
Bohemian Waxwing (Bombycilla garrulus)
Family Laniidae:
Northern Shrike (Lanius excubitor)
Loggerhead Shrike (Lanius ludovicianus)
Family Sturnidae:
European Starling (Sturnus vulgaris)
Family Vireonidae:
Warbling Vireo (Vireo gilvus)
Red-eyed Vireo (Vireo olivaceus)
Solitary Vireo (Vireo solitarius)
Family Emberizidae:
Black-throated Blue Warbler (Dendroica caerulescens)
Bay-breasted Warbler (Dendroica castanea)
Yellow-rumped Warbler (Dendroica coronata)
Grace's Warbler (Dendroica graciae)
Magnolia Warbler (Dendroica magnolia)
Black-throated Gray Warbler (Dendroica nigrescens)
Palm Warbler (Dendroica palmarum)
Chestnut-sided Warbler (Dendroica pensylvanica)
Yellow Warbler (Dendroica petechia)
Townsend's Warbler (Dendroica townsendi)
Black-throated Green Warbler (Dendroica virens)
Common Yellowthroat (Geothlypis trichas)
Worm-eating Warbler (Helmitheros vermivorus)
Yellow-breasted Chat (Icteria virens)
Black-and-white Warbler (Mniotilta varia)
Connecticut Warbler (Oporornis agilis)
Macgillivray's Warbler (Oporornis tolmiei)
Northern Parula (Parula americana)
Ovenbird (Seiurus aurocapillus)
Northern Waterthrush (Seiurus noveboracensis)
American Redstart (Setophaga ruticilla)
Orange-crowned Warbler (Vermivora celata)
Tennessee Warbler (Vermivora peregrina)
Nashville Warbler (Vermivora ruficapilla)
Virginia's Warbler (Vermivora virginiae)
Hooded Warbler (Wilsonia citrina)
Wilson's Warbler (Wilsonia pusilla)
Hepatic Tanager (Piranga flava)
Western Tanager (Piranga ludoviciana)
Scarlet Tanager (Piranga olivacea)
Blue Grosbeak (Guiraca caerulea)
Lazuli Bunting (Passerina amoena)
Rose-breasted Grosbeak (Pheucticus ludovicianus)
Black-headed Grosbeak (Pheucticus melanocephalus)
Sage Sparrow (Amphispiza belli)
Lark Bunting (Calamospiza melanocorys)
Lark Sparrow (Chondestes grammacus)
Dark-eyed Junco (Junco hyemalis)
Lincoln's Sparrow (Melospiza lincolnii)
Song Sparrow (Melospiza melodia)
Savannah Sparrow (Passerculus sandwichensis)
Fox Sparrow (Passerella iliaca)
Green-tailed Towhee (Pipilo chlorurus)
Rufous-sided Towhee (Pipilo erythrophthalmus)
Vesper Sparrow (Pooecetes gramineus)
American Tree Sparrow (Spizella arborea)
Brewer's Sparrow (Spizella breweri)
Clay-colored Sparrow (Spizella pallida)
Chipping Sparrow (Spizella passerina)
White-throated Sparrow (Zonotrichia albicollis)
White-crowned Sparrow (Zonotrichia leucophrys)
Harris' Sparrow (Zonotrichia querula)
Red-winged Blackbird (Agelaius phoeniceus)
Bobolink (Dolichonyx oryzivorus)
Rusty Blackbird (Euphagus carolinus)
Brewer's Blackbird (Euphagus cyanocephalus)
Northern Oriole (Icterus galbula)
Brown-headed Cowbird (Molothrus ater)
Common Grackle (Quiscalus quiscula)
Western Meadowlark (Sturnella neglecta)
Yellow-headed Blackbird (Xanthocephalus xanthocephalus)
Family Fringillidae:
Common Redpoll (Carduelis flammea)
Pine Siskin (Carduelis pinus)
Lesser Goldfinch (Carduelis psaltria)
American Goldfinch (Carduelis tristis)
Cassin's Finch (Carpodacus cassinii)
House Finch (Carpodacus mexicanus)
Evening Grosbeak (Coccothraustes vespertinus)
Red Crossbill (Loxia curvirostra)
White-winged Crossbill (Loxia leucoptera)
Pine Grosbeak (Pinicola enucleator)
Family Passeridae:
House Sparrow (Passer domesticus)
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Rocky Mountain National Park