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Ruddy Duck Oxyura jamaicensis L 35-43cm. North American species with established feral populations. Tail is regularly cocked up. Male is unmistakable but female could be mistaken for winter plumage Little Grebe. Adult male has orange-chestnut body plumage, white cheeks and stern, black cap and nape, and bright blue bill; colours are brightest in spring. Adult female has grey-brown plumage with paler cheeks and dark line from base of bill; bill is dull blue-grey. Voice Mostly silent. Status Favours lakes and flooded gravel pits with vegetated margins. Escaped from Slimbridge several decades ago, now locally common in lowland Britain.