Wolverine, amphibian style. "Frog species sprout claws on demand"

"WASHINGTON (Reuters) - At least 11 species of African frogs carry a built-in concealed weapon -- they can sprout claws on demand to fight off attackers, U.S. researchers reported on Monday."

Apparently, the claws break through the skin of the frog, ala our favorite X-Man.

http://feeds.reuters.com/~r/reuters/scienceNews/~3/318779502/idUSN2328658020080624

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