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Penguins Underwater, AntarcticaIn May 2009, Photo of the Day featured images from National Geographic books.Penguins surface near an air hole in Antarctica, captured with a remote underwater camera.From the National Geographic book Visions of Paradise, 2008
Photograph by Maria Stenzel

Photo of the Day: Best of May 2009

View the most popular Photo of the Day images from May 2009, from National Geographic.