Description
The Australian White Ibis is a fairly large ibis species, around 65–75 cm (25–30 in) long and has a bald black head and neck and a long black downcurved beak, measuring over 16.7 cm (6.6 in) in the male, and under in the female. There is some sexual dimorphism in size, as the slightly heavier male weighs 1.7–2.5 kg (3.7-5.5 lb) compared to the 1.4–1.9 kg (3.1–4.2 lb) female. As an comparison, the American White Ibis generally attains 1 kg (2.2 lb) in weight. The body plumage is white although it may become brown-stained. Inner secondary plumes are displayed as lacy black 'tail' feathers. The upper tail becomes yellow when the bird is breeding. The legs and feet are dark and red skin is visible on the underside of the wing. Immature birds have shorter bills. The head and neck are feathered in juveniles.
The White Ibis usually gives off a foul stench. This smell is not described as rotten, but an odd smell that is rather unpleasant and distinct.
The call is a long croak.
The Australian White Ibis reaches sexual maturity in 3 years, and can reach 28 years of age.
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