The Horror Frog, a frog that breaks its own bones to create claws for fighting. Perhaps that sounds like something made up to you, but it is in fact a real animal. There are actually multiple real species possessing such abilities. The two most well known are: the Hairy Frog, which lives in Central Africa and intentionally breaks the bones of its toes to create “claws” when threatened, and the recently discovered Otton Frog, which lives in Southern Japan and possesses a retractable “spike” hidden within a false thumb. More HERE.