North Island kōkako

The North Island kōkako (Callaeas wilsoni) is a forest bird endemic to the North Island of New Zealand. It is grey in colour, with a small black mask. Adults have distinctive blue wattles, earning the species the moniker of blue-wattled crow, though they are not corvids. The name "kōkako" comes from its vocalization: the bird's main call has been described as a "slow, rich 'ko-ka-ko-o-o-o', trailing off at the end".

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