北极熊北极熊全身披着厚厚的白毛,甚至耳朵里和脚掌上都是,仅鼻头有一点黑。它的毛是中空的,起着极好的保温作用。北极熊的体形呈流线型,善游泳,熊掌宽大,因此在北冰洋那冰冷的海水里,它可以用两条前腿奋力前划,后腿并在一起,掌握着前进的方向,一口气可以畅游四五十千米。它奔跑起来,风驰电掣,时速可达60千米,但只善于进行短距离冲刺。 Polar bears polar bear body covered with thick white hair, and even the ears and feet are, only a little black nose. Its hair is hollow, plays an excellent role in insulation. Polar bear body streamline type, good swimming, bear big, so in the Arctic ocean of cold water, it can be two front legs struggling to draw, hind legs and together, hold the forward direction, breath can swim four Fifty kilometers. It runs fast, fast, up to 60 kilometers per hour, but only good at short sprint.