Galápagos Penguins in Nest (2 of 2) (IMAGE)

University of Washington

Galápagos Penguins in Nest (2 of 2)

Caption

Cappello found that the beaks of male Galápagos penguins -- measured from top to bottom -- were slightly thicker than female beaks. Beak size alone could correctly determine the sex of more than 95 percent of the penguins in her study.

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P. Dee Boersma/University of Washington

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