The Santa Caterina Rattlesna is a species of rattlesnake endemic to the mexican island of Santa Caterina.
Most notably, there are no rings, and their tail bases are constantly degenerating, falling off each time they peel off, rather than forming new knots like other rattlesnakes. Since they do not have rings, they can approach their prey quickly and silently, feeding mainly on birds.
This species is relatively young and long, with a maximum length of about 73 cm.
The Rattlesnake of Santa Caterina is in a very dangerous situation and can easily become extinct from the wild. They have only one distribution and an estimated area of less than 100 square kilometers, but their numbers continue to decline. They are threatened by predators that are caught and invaded.