The most damage however was caused by habitat destruction and the other animals humans brought with them, particularly rats (the Polynesian rat or kiore introduced by Māori and the Brown Rat and Black Rat subsequently introduced by Europeans), but also mice, dogs, cats, stoats, weasels, pigs, goats, deer, hedgehogs, and Australian possums.
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A description written by Hutton and an illustration done by Keulemans in Buller’s “A History of the Birds of New Zealand” are evidence that this is the same penguin previously identified by Hutton.
Buller was the author of A History of the Birds of New Zealand (1872–1873, 2nd ed. 1887–1888), with illustrations by John Gerrard Keulemans and Henrik Grönvold.