what kind of tail do poisonous snakes have?
How can you tell what kind of snake you found, and if it is poisonous. With the exception of the Coral Snake (see pix), all poisonous snakes in the USA are pit vipers. This means the Copperhead, the Cottonmouth, and many species of rattlesnakes. These snakes are really fat, with big, fat heads. They have slits for pupils. The rattlesnakes have rattles on the end of their tails.