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The presence of small numbers of Westland petrels (
Procellaria westlandica) off the east and west coasts of South America is a relatively recent discovery. Evidence for the presence of the species in those seas has, however, been found to extend back at least as far as 1913, with the re-identification of a specimen in the American Museum of Natural History collection as
P. westlandica. Preliminary comments are given on the condition of plumage of Westland petrels observed in South American waters.