Why do polar bears have white fur?

Polar bears have white fur to blend into their Arctic environment, helping them hunt and avoid detection. Their fur is actually translucent, not white, and reflects visible light, giving them their snowy appearance. Beneath their fur, they have black skin that absorbs heat from the Sun, helping them stay warm. The hollow structure of their fur also traps air, providing excellent insulation against freezing temperatures. These adaptations make polar bears well-suited to life in one of the coldest regions on Earth.