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Rosenberg’s Gladiator Tree frog

Snikt! Wolverine Frog Has Retractable Bone Claws

The Otton frog, a rare breed of frog native to the islands of Southern Japan, has an evolutionary adaptation as weird as it is awesome -- a retractable bone claw, just like Wolverine. Unlike everyone's favorite tiny Canadian mutant, though, the Otton frog uses its claws for both loving and fighting, sinking the bone spike into a female to keep from being thrown off during mating and using the spike as a weapon when it battles other males for territory.

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