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Callaeidae (wattlebirds; class Aves, order Passeriformes) A family of medium-sized, brown and black or grey birds that have paired fleshy wattles at the corners of their mouths, revealed when at full gape. They have rounded wings, long first primaries, and long tails, and are arboreal and tree-nesting. They feed on insects and fruit. Two monotypic genera, Callaeas and Creadion, are both found in New Zealand. A third species, Heteralocha acutirostris (huia), noted for extreme sexual differentiation of the bill, is now extinct.