Bucephala clangula
Size: 42–50cm (17–20in)

Medium-sized, stocky sea duck.

Male has high-crowned,
‘triangular’ dark head and short bill, with greenish-purple
gloss and circular white patch on cheek; neck and under parts
white contrasting with black back and rump and grey tail;
white inner wing readily seen in flight

. Female smaller than
male; has chocolate-brown head, pale blue-grey upper parts
with white under parts, grey flanks and tail; wings dark with
conspicuous white patch similar to male.

Juvenile resembles
female.

Both sexes readily distinguished from other diving ducks.

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