Size: L: 45 cm. Wt: Males: 680 g. Females: 540 g. Males and females dimorphic in colour and size.

Male: head black with large white crest patch; eye yellow; bill dark grey; breast white, bisected by black band; flanks light brown; back black, with small white wing patch.

Female: head brown, with reddish-brown crest; bill dark brownish-black; breast and flanks mottled brown; back blackish, with white wing patch.

Juvenile: similar to female, but much paler, less reddish.

Duckling: downy; back, head, and upper breast brown; cheeks pale; throat, lower breast, and belly white; white patches on wing, and upper back; bill slender.