ECTLS - De quelle couleur est la peau des ours blancs ? - Vidéo Dailymotion

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Transcript

00:00 The skin of white bears is not white, their hair neither.

00:03 Because they live in a complicated environment, polar bears do indeed need the advantages of the two colors, white and black, to survive.

00:12 Black skin is especially to protect themselves from the cold.

00:15 Although they have a thick layer of fat and a thick coat, black retains heat better.

00:20 And even if the amount of sun rays is very low to reach the skin, it is always that of gold when temperatures drop to -30 or -40.

00:28 But even with its 350 to 700 kg in the males, the animal could not survive on the bench.

00:35 And that's why above, it has not one layer of hair but two.

00:39 The first is the burr, a very dense duvet.

00:41 The second, the "jares", that is to say the long hair layers.

00:44 And the polar bear's hair is not white either, they are actually translucent.

00:49 And it is indeed the reflection of light in these transparent hairs that makes them white, or more precisely slightly yellowish.

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