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" ... Pachyptila prions are a small group of closely-related seabirds that have the same ancestor (“monophyletic”). They are pigeon-sized, with white underparts, blue-grey upper parts, and a soot-colored “M” that extends across their back from one long slender wingtip to the other. They roam widely across the Antarctic Ocean and they all look remarkably similar to each other, especially when glimpsed as they zoom over rough, wind-tossed sub-Antarctic seas. ... "