Feeding Behavior

Wide variety of foraging methods -- dabbles at surface of water, upends in shallows, dives underwater (propelled by feet), grazes on land. Also steals food from various ducks.

Eggs

6-11, sometimes 2-12. Buff to grayish with brown spots. Nests with more than 12 eggs probably indicate laying by more than 1 female. Incubation by both sexes, 21-25 days. Young: can swim well soon after hatching; follow parents and are fed by them. At night, young are brooded on a nest-like platform built by male. Young probably able to fly at about 7-8 weeks after hatching. 1 or 2 broods per year.

Young

can swim well soon after hatching; follow parents and are fed by them. At night, young are brooded on a nest-like platform built by male. Young probably able to fly at about 7-8 weeks after hatching. 1 or 2 broods per year.

Diet

Omnivorous. Eats mostly plant material, including stems, leaves, and seeds of pondweeds, sedges, grasses, and many others, also much algae. Also eats insects, tadpoles, fish, worms, snails, crayfish, prawns, eggs of other birds.

Nesting

Very aggressive in defense of nesting territory. In courtship, male may pursue female across water. Displays include swimming with head and neck lowered, wings arched, tail raised to show off white patches. Nest site is among tall marsh vegetation in shallow water. Nest (built by both sexes) is floating platform of dead cattails, bulrushes, sedges, lined with finer materials, anchored to standing plants. Several similar platforms may be built, only one or two used for nesting.