Prairie rattlesnakes have gray-green bodies with greenish blotches bordered by a darker green/brownish ring. The color pattern allows them to blend in with the prairie landscape. Their most identifiable features are their triangular-shaped head, skinny neck, and blunt tail. Rattlesnakes have 2 curved fangs and use their jaw muscles to squeeze venom from glands on each side of the snake's head into the hollow fangs. The venom comes out of slits on the front side of the fangs and is used to kill its prey. The rattlesnake’s trademark rattle is composed of a series of hollow beads which are actually modified scales from the tail tip. When threatened, rattlesnakes vibrate their tails creating a loud rattling sound. Each time the snake sheds its skin, a new rattle segment is added.