Gadwall
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The Gadwall (Anas strepera) is a common and widespread duck which breeds in the northern areas of Europe and Asia and central North America. The range of this bird appears to be expanding into eastern North America.
This dabbling duck is strongly migratory and winters further south than its breeding range. It is not as gregarious as some dabbling ducks outside of the breeding season and tends to form only small flocks.
The Gadwall is 46-56 cm long with a 78-90 cm wingspan. The breeding male is a beautifully patterned grey, with a black rear end and a brilliant white speculum, obvious in flight or at rest. In non-breeding (eclipse) plumage, the drake looks more like the female.
The females are light brown, with plumage much like a female Mallard. They can be distinguished from that species by the dark orange-edged bill, smaller size, and lack of an obvious speculum.
The Gadwall is a bird of open wetlands, such as prairie lakes, wet grassland or marshes with dense fringing vegetation, and usually feeds by dabbling for plant food with head submerged. It nests on the ground, often some distance from water. The young birds are fed insects at first; adults also eat some mollusks and insects during the nesting season.
This is a fairly quiet species. The male has a hoarse whistling call, whereas the female has a mallard-like quack.
In Great Britain the Gadwall is a scarce breeding bird and winter visitor, though it has increased in recent years. It is likely that they were partly intoduced, mainly to England, and partly colonised Great Britain, with continental birds colonising Scotland.
The Gadwall is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds (AEWA) applies.
Photo gallery
References
- BirdLife International (2004). [Anas strepera]. 2006 IUCN Red List of Threatened Species. IUCN 2006. Retrieved on 11 May 2006. Database entry includes justification for why this species is of least concern
External links
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