Aves | Anseriformes
SAUP Database. 2006. (Ref. 356)
Size / Weight / Age
Max length : 49.0 cm TL male/unsexed; (Ref. 94965); max. published weight: 900.00 g (Ref. 356)
Climate / Range
Northeast Pacific and Western Atlantic: Winters from Aleutian Islands to Gulf of St Lawrence, to Californian Gulf, Mexican Gulf, Georgia south to Florida.
Culmen: 3.135 cm; tarsus: 8.105 cm; wing: 21.15 cm.
Coastal (Ref. 356). Breeds in freshwater and along coasts (in Sweden and in the Gulf of Bothnia); nests in hollow trees or artificial nest-boxes. Martens (Martes martes) and jays (Garrulus glandarius) known to feed on its eggs. Ducklings preferentially feed in lakes. Main diet include Corixidae, Notonecta, Ephemerida larvae (mainly Leptophlebia vespertina), Dytiscidae adults (mainly Hyphydrus ovatus) and larvae (mainly Acilius and Dytiscus), and Chaoborus larvae (Ref. 95144). Displays dabbling behavior (Ref. 356).
IUCN Red List Status (Ref. 114614)
CITES status (Ref. 94142)
Threat to humans
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Estimation of some characteristics with mathematical models