According to Daily Mail ,  recently, a group of wildlife-lover take yacht ahead to the Arctic Ocean, exploring and admiring the polar animals. One day, these people were ready for lunch, suddenly got an unasked guest: a polar bear, popping its head into kitchen for food.

It stretched head into kitchen's porthole, observing whether there was anything to eat.

Finally, the bear got nothing, leaving disappointedly.

The polar bear is the second largest land carnassial beast in the world. Male bear’s length reaches 240-260 cm, usually weighed about 400-800kg. Female, on the other hand, only has the half-size of a male one’s, length's approximately 190-210cm, weighed about 200-300 kg. But they could be weighed 500kg when hibernation period comes, due to huge amount of fat accumulation. Currently, there are about 20,000 plus polar bears living in the world, and this number is relatively steady. Due to rising temperature, ice in the North Polar starts to melt, which jeopardizes polar bear’s habitat, what’s worse, their food is reducing too. On the other hand, even the bears have great swimming skills, they could not stay in the water for too long, because the increasingly expanding ocean surface makes them getting drowned more easily. Scientists warn that the number of polar bear will reduce 2/3 by 2050 resulting from globe warming and melting ice. Of these, Alaska bear will be extinct by then. (Tang Ning, via www.sina.com)

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