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.