Size: L: 65 cm. Wt: Males: 1600 g. Females: 1200 g. Sexually dimorphic in size and colour. Males of this species exhibit eclipse plumage.

Male: head dark metallic green; bill thin, hooked, red; breast, belly, and flanks white; back dark with white wing edge showing; tail gray.

Female: head chestnut, with small crest; chin white; bill orange; breast whitish; flanks, back, and tail mottled gray.

Eclipse Male: similar to female, but with male wing pattern.

Juvenile: similar to female, but chin spotted with black, and black band around neck.

Duckling: downy; dark brown above; white below; sides of neck, nape, and sides of head chestnut; pale spot on lores; white patches on wings and rump.