Snakes are cold blooded reptiles. They do not produce their own internal heat and must regulate their body temperatures by absorbing or giving off heat. Accordingly, they rely on the sun or resting on heated surfaces to raise their body temperatures. Conversely they must take cover in cooler places in order to lower their body temperatures. Consequently, snakes must also have access to cover. Snakes feed mostly on animal foods such as insects, worms, eggs and small birds or mammals. Most snakes prefer cool, dark places where food is abundant.