Both drakes and hens have yellowish bills with orange legs and feet.

Juveniles have pale yellow underparts and a yellowish bill.

The adult male is unmistakable, being all black with some pale feather fringes on its back, and with a yellowish or pink bill.

The female has a more yellowish bill with black on the basal half and on the casque.

It has brownish-grey upperparts, white underparts and yellowish bill.

Its bill is long, heavy, and downcurved, yellowish bill with a darker tip.

The adult male is black apart from a golden cap, white and red thighs, pink legs and a yellowish bill.

They have a round head with ear tufts, yellow eyes and a yellowish bill.

It is a dull brown above, with grey underparts, and has a yellowish, downward-curving bill.

The adult male is all black except for a white crescent on the breast and a yellowish bill.