Polar bear, also known as the white bear, is a bear growing in the Arctic. It is the largest carnivorous animal on land. In the space where polar bear lives, it is the top layer of the food chain. It has very thick fat and hair to keep warm. Its white appearance is a good protective color on snowy white. The Polar bear can capture food not only on land but also at sea. These features make them able to survive in the harsh climate of the Arctic.

The polar bear’s hair is transparent. It looks white because of the refraction of the sun. The white fur can make the polar bears track and assault their prey on the ice. The young polar bear’s fur is pure white, which can help camouflage and hide. When it grows up, the fur will slowly turn into a light yellow color.

Polar bears are good swimmers. They can be found in the ocean at which is miles away from the mainland. This may be the signal that they began to evolve to capture prey in the sea, but recent evidence suggests that the melting of the glaciers caused by the greenhouse effect has forced them to make choices. They are also highly efficient in hunting on land. This is because they run at a very high speed, they even run faster than humans. The polar bears can run up and rushed to a speed of 60 kilometers per hour, but they could not last long, only a short distance sprint. Polar bears’ claws are like iron hooks, and their teeth are extremely sharp. With its forefoot flapping, it can easily smash a person’s head off.