any of various poisonous American pit vipers (genera Crotalus and Sistrurus), having an interlocking series of horny rings at the end of the tail that produce a rattling or buzzing sound when shaken
Any of various venomous pit vipers of the genera Crotalus and Sistrurus of the Americas, having at the end of the tail a series of loosely attached, horny segments that can be vibrated to produce a rattling or buzzing sound.
western massasauga rattlesnake
Sistrurus catenatus subsp. tergeminus