Polar bears have a unique adaptation in their fur that helps them survive in their cold Arctic environment. Their fur is made up of two layers - a thick undercoat and longer guard hairs on top. This fur adaptation provides excellent insulation and helps them stay warm in freezing temperatures. Additionally, the outer guard hairs are actually translucent, which helps to trap heat from the sun and insulate the bear's body. This fur adaptation allows polar bears to maintain their body temperature and survive in the harsh conditions of their icy habitat.
