Polar bear - the largest land mammals of the representative of prey. Its length is 3 m, weight up to 1 t usually males weigh 400-450 kg, body length of 200-250 cm, height at withers to 130-150 cm Females much smaller (200-300 kg). The smallest bears are found on Spitsbergen, the largest - in the Bering Sea. Polar bear from other bears distinguish long neck and flat head. His skin is black. Coat color varies from white to yellow, in the summer the fur may turn yellow due to constant exposure to sunlight. Polar bear fur is devoid of pigment stains and hairs are hollow. Translucent hairs allow only ultraviolet light, giving the coat insulating properties. [5] When ultraviolet photography polar bear appears dark. Due to the structure of the hairs white bear can sometimes "go green." This happens in a hot climate (in zoos), when the hairs get turned inside microscopic algae.
