The blue-winged teal (Spatula discors) is a species of bird in the duck, goose, and swan family Anatidae. One of the smaller members of the dabbling duck group, it occurs in North America, where it breeds from southern Alaska to Nova Scotia, and south to northern Texas. A molecular phylogentic study comparing mitochondrial DNA sequences published in 2009 found that the genus Anas, as then defined, was non-monophyletic. The genus was subsequently split into four monophyletic genera with ten species including the blue-winged teal moved into the resurrected genus Spatula. This genus had been originally proposed by the German zoologist Friedrich Boie in 1822. The name Spatula is the Latin for a "spoon" or "spatula".<!--Job p. 361--> The specific epithet discors is the Latin for "different" or "at variance".
Description
right|150px|thumb|Call
thumb|left|Blue-winged teal drake in flight at [[Sacramento National Wildlife Refuge]]
The blue-winged teal is long, with a wingspan of , and a weight of .
The breeding range extends from east-central Alaska and southern Mackenzie District east to southern Quebec and southwestern Newfoundland. In the contiguous United States it breeds from northeast California east to central Louisiana, central Tennessee, and the Atlantic Coast. The blue-winged teal winters from southern California to western and southern Texas, the Gulf Coast to the Atlantic Coast, the Caribbean, and south to Central and South America. It is often seen wintering as far south as Brazil and central Chile.
The blue-winged teal is primarily found in the northern prairies and parklands. It is the most abundant duck in the mixed-grass prairies of the Dakotas and the prairie provinces of Canada. The blue-winged teal is also found in wetlands of boreal forest associations, shortgrass prairies, tallgrass prairies, and deciduous woodlands. The nest is a shallow depression on the ground lined with grass and down, usually surrounded by vegetation.
Blue-winged teal generally lay 10 to 12 eggs. Delayed nesting and re-nesting efforts have substantially smaller clutches, averaging five to six eggs. Clutch size can also vary with the age of the hen. Yearlings tend to lay smaller clutches. Incubation takes 21 to 27 days.
Blue-winged teal ducklings can walk to water within 12 hours after hatching but do not fledge until 6 to 7 weeks.
Food habits
thumb|Males in [[Sarpy County, Nebraska]]
Blue-winged teal are surface feeders and prefer to feed on mud flats, in fields, or in shallow water where there is floating and shallowly submerged vegetation plus abundant small aquatic animal life. They mostly eat vegetative matter consisting of seeds or stems and leaves of sedge, grass, pondweed, smartweed (Polygonum spp.), duckweed (Lemna spp.), Widgeongrass, and muskgrass (Chara spp.).