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The Magenta petrel, Pterodroma magentae, is a distinct species, closely allied to the Pterodroma macroptera group of gadfly petrels, which agrees in size and appearance with the Chatham Island taiko, apparently last recorded alive at its breeding places between twenty-five and fifty years ago. A large collection of bones of this and other petrels from the Chatham Islands in the British Museum (Natural History) appears to include several other species also new to the group. It is suggested that some of these may still survive there.