This is a list of bird species confirmed in the Canadian province of Nova Scotia. Unless otherwise noted, the list is that of the Nova Scotia Bird Society (NSBS) as of 2021. The Society's field checklist contains 308 species, some of which are seen regularly but only in small numbers. To that list are added an additional 169 uncommon species from the full NSBS list. Of the resulting 491 species presented here, 246 are accidental and seven were introduced to North America. Birds that are considered probable escapees or to have been released, although they may have been sighted flying free, are not included. 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 Canadian English spellings are used and the common names of families are from the Clements taxonomy because the AOS list does not include them. (A) Accidental - a species that rarely or accidentally occurs in Nova Scotia (I) Introduced - a species introduced to Nova Scotia as a consequence, direct or indirect, of human actions Ducks, geese, and waterfowl Order: AnseriformesFamily: Anatidae 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) Greylag goose, Anser anser (A) Greater white-fronted goose, Anser albifrons (A) Tundra bean-goose, Anser serrirostris (A) Pink-footed goose, Anser brachyrhynchus (A) Cackling goose, Branta hutchinsii (A) Canada goose, Branta canadensis Brant, Branta bernicla Barnacle goose, Branta leucopsis (A) Mute swan, Cygnus olor (I) (A) Trumpeter swan, Cygnus buccinator (A) Tundra swan, Cygnus columbianus (A) Wood duck, Aix sponsa 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 Northern pintail, Anas acuta Green-winged teal, Anas crecca Canvasback, Aythya valisineria (A) Redhead, Aythya americana Ring-necked duck, Aythya collaris Tufted duck, Aythya fuligula (A) Greater scaup, Aythya marila Lesser scaup, Aythya affinis King