TRISTRAM'S STORM-PETREL Oceanodroma tristrami

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A large, little-known species, breeding in the Hawaiian chain and probably the Bonin and Izu Islands. Seen well the greyish colouration on the back and sides of the rump is diagnostic, but at range it can look like a Matsudaira's, Swinhoe's or even dark-rumped Leach's. Solitary behaviour and a dislike of ships doesn't help matters.

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