The polar bear (Ursus maritimus) is a bear native to the Arctic. It is the world's largest land carnivore, with most adult males weighing 300-600 kg (660-1320 lb); adult females are about half the size of males. Its fur is hollow and translucent, but usually appears as white or cream coloured, thus providing the animal with effective camouflage. Its skin is actually black in color.[2] Its thick blubber and fur insulate it against the cold. The bear has a short tail and small ears that help reduce heat loss, as well as a relatively small head and long, tapered body to streamline it for swimming.