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and, probably the longest of all (perhaps exceeding 150 cm) thanks in part to its extended tail feathers, the helmeted hornbill (Rhinoplax vigil). Males are always bigger than the females, though the extent to which this is true varies according to species. The extent of sexual dimorphism also varies with body parts. For example, the difference in body mass between males and females is 1-17%, but the variation is 8-30% for bill length and 1-21% in wing length.

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