Rattlesnakes
Rattlesnakes are found in the Western hemisphere, living in plains, mountains, and deserts. While there are 24 different species of rattlesnake, all of them have that distinct rattle found at the tip of their tail, producing the spine-tingling sound that never bodes well for anyone who hears it. The rattle is meant to warn potential attackers to keep their distance, yet it also serves to distract prey long enough for an attack to be launched. Rattlesnakes have poor hearing, but they can sense movement through vibrations on the ground. Younger rattlesnakes are unable to control the amount of venom they release when they bite. This ability develops slowly as they grow into adults.