Aves | Anseriformes
SAUP Database. 2006. (Ref. 356)
Size / Weight / Age
Max length : 46.0 cm TL male/unsexed; (Ref. 94965); max. published weight: 622.50 g (Ref. 356)
Climate / Range
Northeast Pacific, Northeast Atlantic and the Arctic. Temperate to polar.
Culmen: 2.555 cm; tarsus: 3.675 cm; wing: 20.15 cm (Ref. 356). Medium-sized duck; male: blue overall; white slashes on shoulder, neck and back; white spots on head and neck; chestnut flanks; female: brown overall; white ear spot (Ref. 94965).
Surface diving; dabbling; coastal. Diet: Crabs (mainly Hemigrapsus nudus, Pagurus spp.), gastropods, polychaetes, amphipods, chitons, Mytilus edulis, limpets, barnacles, Clupea pallasi (eggs) and algae (Ref. 3985).
IUCN Red List Status (Ref. 114614)
CITES status (Ref. 94142)
Threat to humans
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Estimation of some characteristics with mathematical models