Tony Pym/Ornitholidays
Henderson Petrel Pterodroma atrata is a rare seabird known to breed only on Henderson Island, part of the Pitcairn Islands (a UK Overseas Territory). Predation by Pacific rat Rattus exulans is believed to be the main cause of chick mortality on Henderson, though predation by crabs is also a possiblity. It is likely to have been extirpated from Pitcairn because of predation by feral cats and introduced rats

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