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Pterodroma sandwichensis
An endangered bird that breeds on the Hawaiian archipelago. It was once lumped together with the Galapagos petrel as the "dark-rumped petrel". The bird is threatened by introduced land mammals which predate its eggs and chicks. This bird is a very rare visitor to the west coast of the United States.
Seen on pelagic trip off Half Moon Bay on 8/2/14; mega-rarity for ABA
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