This frog defends itself by snapping its own toe bones into claws
Cameroon's hairy frog has no true claws made of keratin. Instead, each toe hides a small, sharpened bone anchored by collagen; when the frog is grabbed, it deliberately breaks that anchor and forces the bone through its own skin to slash at its attacker. Researchers who described the mechanism in 2008 found no other animal known to weaponize itself quite this way.