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The polar bear is found circumpolar in the northern hemisphere including Canada, Alaska, Greenland, Norway and Russia.
Sea ice and waters along islands and coasts in the Arctic tundra
Males are eight to 10 feet (2.4-3 m) long; females are six and a half to eight and a half feet (2.0-2.6 m) long.
Males weigh 770-1400 pounds (346-630 kg); females average 385-660 pounds (175-300 kg).
Their distinctive white fur covers their entire body except for their nose and footpads.
They have narrower heads, smaller ears and longer teeth than other bears.
Their large paws are partially webbed for swimming.
What Does It Eat?
In the wild: The feed primarily on seals. They may scavenge carcasses of walrus, caribou, and whales. In the summer when prey is scarce, they will eat small mammals, birds, eggs and some vegetation.
At the zoo: Prepared omnivore diet plus fresh fish. Treats include fruit, peanut butter, honey and seaweed.
What Eats It?
Other polar bears and humans prey on the polar bear.
Polar bears are solitary animals. They live and hunt alone except for mating pairs or a mother with cubs. When there is a large food supply they will tolerate other bears nearby.
Females begin breeding at about four years of age, males are usually older; mating occurs in April, May and June. Delayed implantation of the fertilized ovum takes place until the bear has gained enough weight to survive hibernation as well as giving birth and caring for cubs. In December or January a litter of one to three blind, hairless cubs weighing one pound (450 g) are born. They remain denned with their mother until March or April when they weigh about 20 pounds (9 kg). The cubs stay with their mother for two to three years receiving hunting lessons and protection. Lifespan in the wild is 20-25 years and in captivity 25-30 years.
Brrr! It’s Cold!
Polar bears are perfectly adapted for life in the Arctic. They have large bodies that hold heat, but their ears are small to avoid loss of heat. They also have a layer of blubber up to four inches thick to provide insulation. Long, hollow, water-repellent hairs cover the soft under fur that traps air and insulates the body, while their black skin absorbs heat. The only unfurred parts of the body are footpads and the tip of the nose.
Noses with Legs
Polar bears have an extraordinary sense of smell. They can detect a seal’s breathing hole under three feet of snow or ice from more than half mile away. Their sense of smell is their most important sense for detecting prey on land. A polar bear can smell a seal on land 20 miles away.
A Deep Sleep
In some areas, female polar bears hibernate for up to six months. During that time they do not eat, drink or defecate. The females support themselves as well as their cubs on stored fat, which breaks down into carbon dioxide and water. Male polar bears do not hibernate.
Polar bears may wait beside a breathing hole in the ice for hours until a seal comes up for air. Theycrouch low or stretch out flat on the ice to reduce their profile and avoid alerting the seal below. With lightning speed the bear slaps at the seal, hooking it with the sharp claws on its 18-inch paw and pulling the seal through the hole onto the ice.
IUCN Status: Vulnerable.
Once hunted almost to extinction, polar bear numbers have increased since a 1973 agreement limiting hunting and protecting their habitat. Polar bears are a threatened species due to global warming that causes loss of sea ice, the oil industry, poaching and pollution.