Fairly common migrant and winter resident from late August to early May. Found in shallow ponds and marshes. The head of the male is dark green, the female's dull brown.
The birds in this exhibit are a male in breeding plumage (left), a male in non-breeding plumage (center) and a female on the right. Males have black bills. Females have lighter bills, sometimes described as olive green with small dark spots, but also appearing to be orange, with or without spots apparent in current imagaes. All have the unique bill shape that gives the bird its common name.