This list of birds of Wyoming includes species documented in the U.S. state of Wyoming by the Wyoming Game and Fish Department (WGFD) as of May 2021 with some additions from Avibase. The list contains 452 species. Of them, 118 are classed as accidental, and seven species have been introduced to North America. This list is presented in the taxonomic sequence of the Check-list of North and Middle American Birds, 7th edition through the 62nd 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. Unless otherwise noted, all species listed below are considered to occur regularly in Wyoming as permanent residents, summer or winter visitors, or migrants. These tags are used to annotate some species: (A) Accidental - "species with accidental, unpredictable, occurrence" per WGFD (I) Introduced - a species established in North America as a result of human action 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. Forty-one species have been recorded in Wyoming. Snow goose, Anser caerulescens Ross's goose, Anser rossii Greater white-fronted goose, Anser albifrons Brant, Branta bernicla (A) Cackling goose, Branta hutchinsii (A) Canada goose, Branta canadensis Trumpeter swan, Cygnus buccinator Tundra swan, Cygnus columbianus Whooper swan, Cygnus cygnus (A) Wood duck, Aix sponsa Garganey, Spatula querquedula (A) Blue-winged teal, Spatula discors Cinnamon teal, Spatula cyanoptera Northern shoveler, Spatula clypeata Gadwall, Mareca strepera Eurasian wigeon, Mareca penelope (A) American wigeon, Mareca americana Mallard, Anas platyrhynchos Mexican duck, Anas diazi (A) American black duck, Anas rubripes (A) Mottled duck, Anas fulvigula (A) Northern pintail, Anas acuta Green-winged teal, Anas crecca Canvasback, Aythya valisineria Redhead, Aythya americana Ring-necked duck, Aythya collaris Tufted duck, Aythya fuligula (A) 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 (A) 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