Polar Bear
The polar bear is the largest land carnivore and has a reputation as the only animal that actively hunts humans. Found throughout the circumpolar Arctic, they are the most northerly distributed species of bear, with the largest ever recorded polar bear measuring over 12 feet long and weighing a reported 2,210 pounds.
They are strong swimmers and have many adaptations for an aquatic environment - they are well insulated with fat, their nostrils close and their ears are held close to their head when underwater, their feet are partially webbed and the underside is covered with dense pads of fur. This not only offers better traction on land, but also insulates heat. Their eyesight and hearing are excellent, with a sense of smell so developed that they have been known to detect prey up to 20 miles.
Usually solitary, except during the breeding season (mid-summer), they will sometimes aggregate to feed on large whale carcasses, being most active at night. They are carnivorous with a diet that consists mostly of sea mammals such as ringed seals, bearded seals and walruses. The bears will also eat shoreline carrion such as beached whales, fish and crabs.
While out on the ice, a polar bear may go weeks without eating, living entirely off its fat reserves before it kills a seal. The bear's huge stomach allows it to take full advantage of any windfall and can eat up to 150 pounds of food in a single sitting. To maintain its body weight however, on average, a polar bear must kill one seal every five to six days. However, as with most carnivores, it does not digest starches well and the polar bears liver is extremely rich in vitamin A. With between 15,000 and 30,000 units per gram, it makes the flesh extremely toxic to humans (and lethal to the Arctic explorers of previous centuries who used to hunt them for food on long expeditions).
Group Tours
Narwhal and Arctic Wildlife Safari
Search for Narwhals on their spring migration in the High Arctic.
Canada - Classic Polar Bears Tour
See the world's greatest concentration of wild polar bears. 
Canadian Arctic - Classic Polar Bears Tour
See the world's greatest concentration of wild polar bears.
Polar Bear Photography Tour
Spend all day - and night - with polar bears!
Countries
Canadian Arctic
One of the most fascinating and mysterious regions on the planet.
Russian Arctic
A unique and vast expanse of the Russian Far East.
Spitsbergen
Arguably the best place in the whole Arctic to see polar bears.