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Photo: Chaoborus · CC BY-SA 4.0 (May be cropped or resized)
Pterodroma baraui
Range
Main breeding site on Réunion, Indian Ocean
Size
About 40cm
Barau's petrel is a medium-sized gadfly petrel about 40 cm long, whose main breeding site is the island of Réunion in the Indian Ocean. It has white underparts and forehead, a black bill, and dark upperparts with a moderately distinct M pattern across the wings and back (Wikipedia, general species account).