Are rattle snakes extinct

Some populations dwindle, such as the Ridge-nose rattlesnake, the Massasauga, and the Twin-spotted rattlesnake, along with a myriad of other subspecies. I would say that rattlesnake round-ups are the biggest threat to rattlers, although the round-ups do only affect a few species. People also need to be less quick to kill a rattlesnake on "their" property.