Snakes are cold-blooded animals, which is why they sun in the warmer months and go into hibernation during the colder. To help keep body temperatures from dropping too low, sometimes snakes will even hibernate in dens together, thus sharing the limited heat available. Snakes have several different ways to kill prey. Snakes eat such animals as frogs, salamanders, insects, worms, small rodents, and birds. Venomous snakes have sharp, hollow fangs designed to pierce the skin and inject venom. They are located in the upper jaw with venom glands connected above. When not in use, the fangs fold back onto the mouth -