CHRISTOPHER SWANN / SCIENCE PHOTO LIBRARY CHRISTOPHER SWANN / SCIENCE PHOTO LIBRARY
Sperm whales (Physeter macrocephalus). Young sperm whale swimming close to its mother. This toothed whale is found in oceans worldwide. The male reaches an average of 16 metres in length, and can weigh over 45 tons. A sperm whale can live for over 70 years. It is a social animal, living in groups of around a dozen individuals. It feeds on squid, octopus and fish, diving for over an hour to depths of 300 to 800 metres, sometimes as deep as 1-2 kilometres. Photographed in the Gulf of California, Mexico.
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