Size: L: 45 cm. Wt: 900-1000g. Sexually dimorphic in colour, but not in size. This species is not seasonally dimorphic.

Male: head round, dark metallic green; eye yellow; bill blue with black tip; breast sleek black; flanks white; back grey; tail dark brown-black.

Female: head dark purplish-brown; white patch at base of bill; breast dark brown; body mottled brown.

Juvenile: young males similar to females, but no white on face, and paler flanks.