There are approximately fifty species of<unk> , with numerous subspecies. They receive their name for the rattle located at the tip of their tails.  The rattle is used as a warning device when threatened. The scientific name Crotalus derives from the Greek, κρόταλον, meaning "castanet".  The name Sistrurus is the Latinized form of the Greek word for "tail rattler" (Σείστρουρος, Seistrouros) and shares its root with the ancient Egyptian musical instrument, the sistrum, a type of rattle.
Most<unk> s mate in the spring.  All species give live birth, rather than laying eggs. The young are self-sufficient from birth. As they do not need their mother after birth, the mother does not remain with her young.
Rattlesnake
Snakebites
Snakebites 
Deaf-mute
Chigger
Wrinkle
Pinna
Seafood