Australian White Ibis
Threskiornis molucca
The Australian white ibis is a fairly large ibis species, around 65–75 cm (26–30 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 a 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.
ID text from Wikipedia, CC BY-SA 4.0
Straw-necked Ibis
Threskiornis spinicollis
Straw-necked ibises are large birds, around 59–76 cm (23–30 in) long, with a bare black head and a long, downcurved black bill. They have a distinctive, highly iridescent plumage, which can appear fairly uniform dirty dark brown in indifferent light; the wings are dark, with an iridescent, multicoloured sheen in sunlight. They have a shiny blue-black back, with a metallic purple, green and bronze glow, and a dark collar. The upper neck is white, as are the underparts and the undertail; their legs are usually red near the top and dark grey toward the feet.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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