The Furriest Animal In the World

In the coldest parts of the world, insulation is essential for survival.  One way is to have a good thick layer of blubber under your skin. But anyone that's seen a walrus flopping across the beach knows that fat can have its downsides. To stay both warm and agile, fat won't do.  The Arctic fox can withstand polar winters, surviving long periods below -20 °C (-4 °F), thanks to some incredible adaptations.

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Sharks Get Worry-Free Tans

Even sharks can get a tan. Sharks' skin turns from dark brown to black as the pigment melanin increases in direct response to radiation. In other fish, the exposure can lead to skin cancer. Sharks, however, just seem to tan. What's their secret? The answer could hold the key to preventing skin disease in humans.

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