Size: L: 130cm. Wt: Males: 7100 g. Females: 6200 g. Males and females similar; males slightly heavier than females. This species is not seasonally dimorphic.

Adult: body white; patch of facial skin black, many individuals with small yellow spot in front of eye; neck straight; legs dark.

Juvenile: similar to adult, but plumage pale grey; bill flesh-coloured, with black markings.