What unique physical structure identifies snakes belonging to the Genus *Crotalus*?

Answer

A rattle composed of interlocking keratinous segments

Snakes in the genus *Crotalus* are uniquely identifiable by the presence of a rattle made of interlocking keratinous segments located at the end of the tail, which they use for defense.

What unique physical structure identifies snakes belonging to the Genus *Crotalus*?
taxonomyanimalreptilesnake