|Conservation status||Numbers are thought to be declining. Flocks at sea are vulnerable to oil spills and other pollution.|
|Family||Ducks and Geese|
|Habitat||Seacoasts; in summer, coastal tundra. Breeding habitat includes low-lying wet tundra and higher slopes in treeless terrain, also openings around lakes in northern forest. In winter mostly on bays and along exposed coastlines, usually over shallow water within a mile of shore. Migrants stop on Great Lakes and other fresh waters, some remaining for winter.|
Forages by diving and swimming underwater, propelled by feet; wings may be folded or partly opened.
7-8, sometimes 5-11. Whitish to pale buff. Incubation is by female, roughly 27-33 days. Young: Leave nest shortly after hatching and go to water. Female tends young (and broods them at night while small), but young feed themselves. Age at first flight about 6-7 weeks.
Leave nest shortly after hatching and go to water. Female tends young (and broods them at night while small), but young feed themselves. Age at first flight about 6-7 weeks.
Mainly mollusks, insects. At sea feeds mainly on mollusks, especially mussels and other bivalves; also crustaceans, marine worms, echinoderms. In summer on fresh water eats many aquatic insects, also fish eggs, mollusks, small fish, some plant material.
Several males may court one female, surrounding her on water. Displays of male include rushing along surface of water with back hunched and head low, bowing jerkily while calling, and quickly snapping tail up to vertical position over back. Nest site is on ground, usually near water, often on a hummock or ridge on tundra, generally hidden by grasses or low scrub. Nest (built by female) is a shallow depression lined with plant material and with down.
Text © Kenn Kaufman, adapted from
Lives of North American Birds
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Tends to migrate early in spring and late in fall. In migration along coast, flocks fly low over sea well offshore. When traveling overland, may make long nonstop flights at high altitude.
- All Seasons - Common
- All Seasons - Uncommon
- Breeding - Common
- Breeding - Uncommon
- Winter - Common
- Winter - Uncommon
- Migration - Common
- Migration - Uncommon
See a fully interactive migration map for this species on the Bird Migration Explorer.Learn more
Songs and CallsIn spring a musical whistled cour-loo.
Learn more about this sound collection.