Size: L: 50cm. Wt: Males: 770 g. Females: 680 g. Sexually dimorphic in size and colour. Males of this species exhibit eclipse plumage.

Male: white crown; broad green stripe from eye to back of head; face and neck speckled gray; breast and flanks light chestnut; back light brown; green speculum, bordered with black; bill blue with black tip.

Female: entire head speckled gray, slightly darker on crown; breast and flanks pale chestnut; back mottled brown; green speculum, bordered with black.

Eclipse Male: head as in female; breast and flanks darker chestnut than breeding male; back mottled dark brown.

Duckling: downy; drab brown above; buff below; short streak behind eye.