The endangered North Island kōkako (Callaeas wilsoni) name is an Māori word that comes from the bird's distinctive vocalisation and call. A rare, blue-grey New Zealand forest bird famous for its haunting, organ-like duets and poor flying ability, they have fleshy, brightly coloured skin flaps hanging below their beaks — royal blue in the North Island kōkako, and orange in the South Island kōkako is presumed extinct. They have short, rounded wings and prefer to use their exceptionally strong, long legs to run and bound through tree canopies rather than fly.
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