DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Polar bear den entrance. The polar bear (Ursus maritimus), the world's largest land predator, is found throughout the Arctic circumpolar regions, although its range is limited by the extent of the pack ice. This den is inhabited by a mother polar bear and her cubs, who were born during the winter and have recently emerged at the start of spring. The cubs will stay with their mother for between a year and a half and two and a half years. Photographed in March in Wapusk National Park, Manitoba, Canada.
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