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WordNet
white-chinned petrel

n. large black petrel of southern seas having a white mark on the chin [syn: Procellaria aequinoctialis]

Wikipedia
White-chinned petrel

The white-chinned petrel or Cape hen, Procellaria aequinoctialis, is a large shearwater in the family Procellariidae. It ranges around the Southern Ocean as far north as southern Australia, Peru and Namibia, and breeds colonially on scattered islands.