Size: L: 130 cm. Wt: 1500-1800g. Males slightly heavier than females. This species is not seasonally dimorphic, and birds reach adult plumage in second year.
Adult: body irridescent black; tail short; large, orange-red throat pouch; double crest of two whitish tufts on head.
Juvenile: brown upperparts; pale underparts, esp. neck and breast; orange-red pouch already present.
Nestling: altricial and naked on hatching; skin brownish, turning blackish-purple; short, black, woolly down appears at 6 days of age.