In the U.S. state of Colorado 519 species of birds have been documented as of September 2022 according to the Colorado Bird Records Committee (CBRC) of Colorado Field Ornithologists.
This list is presented in the taxonomic sequence of the Check-list of North and Middle American Birds, 7th edition through the 63rd Supplement, published by the American Ornithological Society (AOS). Common and scientific names are also those of the Check-list, except that the common names of families are from the Clements taxonomy because the AOS list does not include them.
Six of the documented birds are introduced species that are not native to North America, but were brought to this continent by humans. They are marked on this list as (I). Birds that are considered probable escapees, although they may have been sighted flying free in Colorado, are not included. An accidental species has been added from another source.
Ducks, geese, and waterfowl
Order: AnseriformesFamily: Anatidae
The family Anatidae includes the ducks and most duck-like waterfowl, such as geese and swans. These birds are adapted to an aquatic existence with webbed feet, bills which are flattened to a greater or lesser extent, and feathers that are excellent at shedding water due to special oils.
Black-bellied whistling-duck, Dendrocygna autumnalis Fulvous whistling-duck, Dendrocygna bicolor Snow goose, Anser caerulescens Ross's goose, Anser rossii Greater white-fronted goose, Anser albifrons Pink-footed goose, Anser brachyrhynchus Brant, Branta bernicla Barnacle goose, Branta leucopsis Cackling goose, Branta hutchinsonii Canada goose, Branta canadensis Trumpeter swan, Cygnus buccinator Tundra swan, Cygnus columbianus Wood duck, Aix sponsa Garganey, Spatula querquedula Blue-winged teal, Spatula discors Cinnamon teal, Spatula cyanoptera Northern shoveler, Spatula clypeata Gadwall, Mareca strepera Eurasian wigeon, Mareca penelope American wigeon, Mareca americana Mallard, Anas platyrhynchos Mexican duck, Anas diazi American black duck, Anas rubripes Mottled duck, Anas fulvigula Northern pintail, Anas acuta Green-winged teal, Anas crecca Canvasback, Aythya valisineria Redhead, Aythya americana Ring-necked duck, Aythya collaris Tufted duck, Aythya fuligula Greater scaup, Aythya marila Lesser scaup, Aythya affinis Harlequin duck, Histrionicus histrionicus Surf scoter, Melanitta perspicillata White-winged scoter, Melanitta deglandi Black scoter, Melanitta americana Long-tailed duck, Clangula hyemalis Bufflehead, Bucephala albeola Common goldeneye, Bucephala clangula Barrow's goldeneye, Bucephala islandica Hooded merganser, Lophodytes cucullatus Common merganser, Mergus merganser Red-breasted merganser, Mergus serrator Ruddy duck, Oxyura jamaicensis
New World quail Order: GalliformesFamily: Odontophoridae
The New World quails are small, plump terrestrial birds only distantly related to the quails of the Old World, but named for their similar appearance and habits.
Northern bobwhite, Colinus virginianus Scaled quail, Callipepla squamata California quail, Callipepla californica (I) Gambel's quail, Callipepla gambelii
Pheasants, grouse, and allies
Order: GalliformesFamily: Phasianidae
Phasianidae consists of the pheasants and their allies. These are terrestrial species, variable in size but generally plump with broad and relatively short wings. Many species are gamebirds or have been domesticated as a food source for humans.
Wild turkey, Meleagris gallopavo Ruffed grouse, Bonasa umbellus White-tailed ptarmigan, Lagopus leucurus Greater sage-grouse, Centrocercus urophasianus Gunnison sage-grouse, Centrocercus minimus Dusky grouse, Dendragapus obscurus Sharp-tailed grouse, Tympanuchus phasianellus Greater prairie-chicken, Tympanuchus cupido Lesser prairie-chicken, Tympanuchus pallidicinctus Ring-necked pheasant, Phasianus colchicus (I) Chukar, Alectoris chukar (I)
Grebes
Order: PodicipediformesFamily: Podicipedidae
Grebes are small to medium-large freshwater diving birds. They have lobed toes and are excellent swimmers and divers. However, they have their feet placed far back on the body, making them quite ungainly on land.
Pied-billed grebe, Podilymbus podiceps Horned grebe, Podiceps auritus Red-necked grebe, Podiceps grisegena Eared grebe, Podiceps nigricollis Western grebe, Aechmorphorus occidentalis Clark's grebe, Aechmorphorus clarkii
Pigeons and doves
Order: ColumbiformesFamily: Columbidae
Pigeons and doves are stout-bodied birds with short necks and short slender bills with a fleshy cere.
Rock pigeon, Columba livia (I) Band-tailed pigeon, Patagioenas fasciata Eurasian collared-dove, Streptopelia decaocto (I) Inca dove, Columbina inca Common ground dove, Columbina passerina Ruddy ground dove, Columbina talpacoti White-winged dove, Zenaida asiatica Mourning dove, Zenaida macroura
Cuckoos Order: CuculiformesFamily: Cuculidae
The family Cuculidae includes cuckoos, roadrunners, and anis. These birds are of variable size with slender bodies, long tails, and strong legs. The Old World cuckoos are brood parasites.
Groove-billed ani, Crotophaga sulcirostris Greater roadrunner, Geococcyx californianus Yellow-billed cuckoo, Coccyzus americanus Black-billed cuckoo, Coccyzus erythropthalmus
Nightjars and allies
Order: CaprimulgiformesFamily: Caprimulgidae
Nightjars, also called goatsuckers, are medium-sized nocturnal birds that usually nest on the ground. They have long wings, short legs, and very short bills. Most have small feet, of little use for walking, and long pointed wings. Their soft plumage is cryptically colored to resemble bark or leaves.
Lesser nighthawk, Chordeiles acutipennis Common nighthawk, Chordeiles minor Common poorwill, Phalaenoptilus nuttallii Eastern whip-poor-will, Antrostomus vociferus Mexican whip-poor-will, Antrostomus arizonae
Swifts
Order: ApodiformesFamily: Apodidae
The swifts are small birds which spend the majority of their lives flying. These birds have very short legs and never settle voluntarily on the ground, perching instead only on vertical surfaces. Many swifts have very long, swept-back wings which resemble a crescent or boomerang.
Black swift, Cypseloides niger Chimney swift, Chaetura pelagica Vaux's swift, Chaetura vauxi White-throated swift, Aeronautes saxatalis
Hummingbirds
Order: ApodiformesFamily: Trochilidae
Hummingbirds are small birds capable of hovering in mid-air due to the rapid flapping of their wings. They are the only birds that can fly backwards.
Mexican violetear, Colibri thalassinus Rivoli's hummingbird, Eugenes fulgens Blue-throated mountain-gem, Lampornis clemenciae Ruby-throated hummingbird, Archilochus colubris Black-chinned hummingbird, Archilochus alexandri Anna's hummingbird, Calypte anna Costa's hummingbird, Calypte costae Calliope hummingbird, Selasphorus calliope Rufous hummingbird, Selasphorus rufus Broad-tailed hummingbird, Selasphorus platycercus Broad-billed hummingbird, Cynanthus latirostris White-eared hummingbird, Basilinna leucotis
Rails, gallinules, and coots
Order: GruiformesFamily: Rallidae
Rallidae is a large family of small to medium-sized birds which includes the rails, crakes, coots, and gallinules. The most typical family members occupy dense vegetation in damp environments near lakes, swamps, or rivers. In general they are shy and secretive birds, making them difficult to observe. Most species have strong legs and long toes which are well adapted to soft uneven surfaces. They tend to have short, rounded wings and tend to be weak fliers.
King rail, Rallus elegans Virginia rail, Rallus limicola Sora, Porzana carolina Common gallinule, Gallinula galeata American coot, Fulica americana Purple gallinule, Porphyrio martinica Yellow rail, Coturnicops noveboracensis Black rail, Laterallus jamaicensis
Cranes
Order: GruiformesFamily: Gruidae
Cranes are large, long-legged, and long-necked birds. Unlike the similar-looking but unrelated herons, cranes fly with necks outstretched, not pulled back. Most have elaborate and noisy courting displays or "dances".
Sandhill crane, Antigone canadensis Whooping crane, Grus americana
Stilts and avocets
Order: CharadriiformesFamily: Recurvirostridae
Recurvirostridae is a family of large wading birds which includes the avocets and stilts. The avocets have long legs and long up-curved bills. The stilts have extremely long legs and long, thin, straight bills.
Black-necked stilt, Himantopus mexicanus American avocet, Recurvirostra americana
Plovers and lapwings
Order: CharadriiformesFamily: Charadriidae
The family Charadriidae includes the plovers, dotterels, and lapwings. They are small to medium-sized birds with compact bodies, short thick necks, and long, usually pointed, wings. They are found in open country worldwide, mostly in habitats near water.
Black-bellied plover, Pluvialis squatarola American golden-plover, Pluvialis dominica Killdeer, Charadrius vociferus Semipalmated plover, Charadrius semipalmatus Piping plover, Charadrius melodus Snowy plover, Charadrius nivosus Mountain plover, Charadrius montanus
Sandpipers and allies
Order: CharadriiformesFamily: Scolopacidae
Scolopacidae is a large diverse family of small to medium-sized shorebirds including the sandpipers, curlews, godwits, shanks, tattlers, woodcocks, snipes, dowitchers, and phalaropes. The majority of these species eat small invertebrates picked out of the mud or soil. Different lengths of legs and bills enable multiple species to feed in the same habitat, particularly on the coast, without direct competition for food.
Upland sandpiper, Bartramia longicauda Whimbrel, Numenius phaeopus Eskimo curlew, Numenius borealis (believed extinct) Long-billed curlew, Numenius americanus Hudsonian godwit, Limosa haemastica Marbled godwit, Limosa fedoa Ruddy turnstone, Arenaria interpres Red knot, Calidris canutus Ruff, Calidris pugnax Sharp-tailed sandpiper, Calidris acuminata Stilt sandpiper, Calidris himantopus Curlew sandpiper, Calidris ferruginea Sanderling, Calidris alba Dunlin, Calidris alpina Purple sandpiper, Calidris maritima Baird's sandpiper, Calidris bairdii Least sandpiper, Calidris minutilla White-rumped sandpiper, Calidris fuscicollis Buff-breasted sandpiper, Calidris subruficollis Pectoral sandpiper, Calidris melanotos Semipalmated sandpiper, Calidris pusilla Western sandpiper, Calidris mauri Short-billed dowitcher, Limnodromus griseus Long-billed dowitcher, Limnodromus scolopaceus American woodcock, Scolopax minor Wilson's snipe, Gallinago delicata Spotted sandpiper, Actitis macularia Solitary sandpiper, Tringa solitaria Lesser yellowlegs, Tringa flavipes Willet, Tringa semipalmata Greater yellowlegs, Tringa melanoleuca Wilson's phalarope, Phalaropus tricolor Red-necked phalarope, Phalaropus lobatus Red phalarope, Phalaropus fulicarius
Skuas and jaegers Order: CharadriiformesFamily: Stercorariidae
Skuas and jaegers are in general medium to large birds, typically with gray or brown plumage, often with white markings on the wings. They have longish bills with hooked tips and webbed feet with sharp claws. They look like large dark gulls, but have a fleshy cere above the upper mandible. They are strong, acrobatic fliers.
Pomarine jaeger, Stercorarius pomarinus Parasitic jaeger, Stercorarius parasiticus Long-tailed jaeger, Stercorarius longicaudus
Auks, murres, and puffins Order: CharadriiformesFamily: Alcidae
The family Alcidae includes auks, murres, and puffins. These are short-winged birds that live on the open sea and normally only come ashore for breeding.
Long-billed murrelet, Brachyramphus perdix Ancient murrelet, Synthliboarmphus antiquus
Gulls, terns, and skimmers
Order: CharadriiformesFamily: Laridae
Laridae is a family of medium to large seabirds and includes jaegers, skuas, gulls, terns, kittiwakes, and skimmers. They are typically gray or white, often with black markings on the head or wings. They have stout, longish bills and webbed feet.
Black-legged kittiwake, Rissa tridactyla