38-41 cm (15-16") Fairly common and widespread. Prairie potholes and sloughs, marshes, lakes, ponds, protected bays. Small surface feeding duck.
Male: gray head with distinctive large white crescent between eye and bill; mottled brown body; small white patch on side before tail; dark bill. Song: peeping whistles.
Female: mottled grayish brown overall; dark line through eye; white spot at base of slender dark bill. Very similar to female Green-winged and female Cinnamon teals.
In flight: small, fast flying in compact and agile flocks; light blue patch on forewing, green speculum.
Song: soft quacks.