Crotalus adamanteus is a venomouspit viperspecies found in the southeastern United States.
From the en.wikipedia.org
More examples
Large rattlesnakes; seldom bite unless startled or pursuing prey
Crotalus is a genus of venomous pitvipers found only in the Americas from southern Canada to northern Argentina. The name is derived from the Greek word krotalon, which means "rattle" or "castanet", and refers to the rattle on the end of the tail that make this group so distinctive. ...
A wood rattle-like object which makes a terrifying sound. It replaces the Sanctus Bell during certain Holy Week Masses when the ringing of bells is surpressed.