DOUG ALLAN / SCIENCE PHOTO LIBRARY DOUG ALLAN / SCIENCE PHOTO LIBRARY
Polar bear (Ursus maritimus) swimming. It is an excellent swimmer, sometimes swimming many kilometres between ice floes. The polar bear is a solitary animal, meeting only to mate. It inhabits the ice floes and coastal waters of the Arctic region. It is one of the largest land carnivores, reaching up to 2.5 metres in length and weighing over 800 kilograms. It is a fierce hunter, feeding on seals, fish and birds. It has also been known to attack and kill humans. Photographed off the coast of Canada.
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