This list of birds of Oklahoma includes species documented in the U.S. state of Oklahoma and accepted by the Oklahoma Ornithological Society's Bird Records Committee (OBRC). As of May 2022, there were 488 species on the official list. Of them, 114 are classified as accidental, seven have been introduced to North America, two are known to be extinct, and two others might be extinct. An additional 16 species are classed as either hypothetical or of uncertain origin. 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 Oklahoma as permanent residents, summer or winter visitors, or migrants. These tags are used to annotate some species: (A) Accidental - Species considered rare or accidental by Bird Checklists of the World (the OBRC does not annotate its list with this category) (I) Introduced - a species introduced to North America by the actions of humans, either directly or indirectly (E) Extinct - a species that no longer exists (H) Hypothetical - "species seen in the state and supported only by written documentation" per the OBRC (UO) Uncertain Origin - species whose provenance is unknown 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 (A) Fulvous whistling-duck, Dendrocygna bicolor (A) Snow goose, Anser caerulescens Ross's goose, Anser rossii (A) Greater white-fronted goose, Anser albifrons Brant, Branta bernicla Barnacle goose, Branta leucopsis (A) Cackling goose, Branta hutchinsii Canada goose, Branta canadensis Mute swan, Cygnus olor (I) (UO) Trumpeter swan, Cygnus buccinator Tundra swan, Cygnus columbianus (A) Wood duck, Aix sponsa Baikal teal, Sibirionetta formosa (H) Garganey, Spatula querquedula (A) Blue-winged teal, Spatula discors Cinnamon teal, Spatula cyanoptera (A) Northern shoveler, Spatula clypeata Gadwall, Mareca strepera Eurasian wigeon, Mareca penelope American wigeon, Mareca americana Mallard, Anas platyrhynchos American black duck, Anas rubripes