X-Men fans rejoice: Wolverine has come to life, as a frog. When the comic book warrior faces a fight, metallic blades spring forth from his hand. A new study concludes that certain African frogs are similarly equipped, having sharp, claw-shaped bones that pierce through their own fingertips when the animal is threatened. More than 100 years ago, scientists observed the mysterious bony appendages in museum specimens of the Arthroleptidae frog family, but they had no idea what to make of them. (source: publishing.royalsociety.org)
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