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Polar bear
Ursus maritimus or the "sea bear."
Polar bears live near the circumpolar at north in areas where they can hunt seals at open leads. Scientists estimate that there are between 22000 to 27000 polar bears. Its closest relative is the brown bear. Adult male polar bears are 2,5 to 3 meters tall . They weigh 250 to 770 kilograms. Adult female bears are smaller. They are about 1,8 to 2,5 meters tall and weigh 90 to 320 kilograms. Polar bears usually eat seals – usually the ringed seasl, but sometimes the bearded seals. When hunting is good , polar bears will typically eat only the fat and leave the rest of the carcass for scavengers including arctic foxes, ravens , and younger bears. Polar bears also sometimes kill and eat both walrus and beluga whales. They have even hunted short-legged reindeer and sometimes even birds and bird eggs. Polar bears are top of the food chain in the Arctic. They help to keep the balance of nature by preventing an overpopulation of seals. In the wild , polar bears live an average of 15 to 18 years , although biologists have tagged a few bears who are 30 years old. One zoo bear in London lived to 41. Female polar bears have their first set of cubs between the ages of four and eight (most frequently at age five or six). At birth , the cubs are 30 to 35 centimeters long and weigh little more than half a kilogram. They are blind , toothless, and covered with short, soft fur. The cubs are born in November or December and remain in the den until March or April. During that time, the mother does not eat, drink , or defecate. There are usually two cubs in a litter. Polar bears cubs normally stay with their mother until they are 2 1/2 years old. Polar bears do not hibernate!