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Sharks Can Tan Worry Free!

Like many animals, sharks skin when exposed to sun turns from a dark brown to black. Similar to humans the pigment melanin increases in response to radiation. The major difference is that sharks do not get skin cancer. 

There have been a lot of laboratory attempts to induce skin cancer in sharks that have all failed. There is however a relatively high prevalence of skin cancer in fish, for example, has been recently reported at sites in the Great Barrier Reef Marine Park.

http://news.discovery.com/animals/sharks-tan-skin-cancer-120815.html

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