CHRISTOPHER SWANN / SCIENCE PHOTO LIBRARY CHRISTOPHER SWANN / SCIENCE PHOTO LIBRARY
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Blue whale skull. Woman looking at the sun-bleached skull of a blue whale (Balaenoptera musculus) washed up on a beach. The blue whale is the world's largest animal and can reach lengths of 27 metres and weigh 120 tonnes. It feeds on small crustaceans, such as krill. Photographed in the Gulf of California, Mexico.
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