This is one frog you don't want to meddle with; Just check out the pinchers on this thing! The Japanese Otton frog, Babina subaspera, is one of the only species of frog in the world that possesses retractable claws like a cat. Each of its spines is contained within a sheath and can be pushed out the front of the digit, but not without puncturing the skin. In other words, the frog has to inflict self-harm to use the spines. In this way, the frog might be more aptly compared to the comic book superhero Wolverine than to a cat.
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