In 2016, a New Zealand ranger became the only human living on a predator-free island; he stayed to guard the last refuge of the world’s heaviest parrot

Off the northwestern coast of Stewart Island sits a small, forested reserve that visitors are not allowed to see. Codfish Island, known in Māori as Whenua Hou, is closed to the public and free of the rats, stoats and possums that have wiped out ground-dwelling birds across mainland New Zealand.

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