A large water bird; 34-43 cm TL; 200-650 g; males larger. Head and neck: Frontal shield and base of bill red, bill tip yellow; crown dark grey; head and neck grey; eye red.
Body: Overall dark grey to dark brown (male), brown (female); primaries tipped with brown. Undersdie brown with bars (female).
Limbs and tail: Legs and feet bright red to dull yellow; toes long; tail short, same as body color.