I think i have figured out why the Negroid Africans......changed colors......from Black to White........what does nature do to match an environment.....?  Deep sea creatures are transparent.......b/c there is no hiding place..........they do not seem like they are there............which is why birds sometime collide with glass windows......why green snakes in the forest are green.....to blend in.....it snows in Europe.....Russia.....white.....to match snow.......husky dogs are white....so are polar bears.....nature's way of camouflaging stuff..

The polar bear is a hypercarnivorous bear whose native range lies largely within the Arctic Circle, encompassing the Arctic Ocean, its surrounding seas and surrounding land masses. It is a large bear, approximately the same size as the omnivorous Kodiak bear. Wikipedia

Conservation status: Vulnerable (Population decreasing) Encyclopedia of Life

Scientific name: Ursus maritimus

Speed: 25 mph (Maximum, Adult, Sprint)

Mass: Male: 990 lbs (Adult, Beaufort Sea population), Female: 330 – 550 lbs (Adult)

Height: Female: 5.9 – 7.9 ft. (Adult, On hind legs), Male: 4.4 ft. (Adult, At Shoulder)