Hibernation is a state of inactivity and metabolic depression in few endotherms (warm blooded animals - bear, rodents) and ectotherms (many reptiles like snakes, turtles an amphibians like frogs. Snakes, lizards, toads, frogs, salamanders and most turtles will mostly hibernate during harsh winters. Hibernating animals usually retreat to a den, a burrow, or a hollow log for protection and shelter. During "true hibernation," the animal's body temperature drops, and its rate of breathing slows down. These hibernating animals are very difficult to awaken. Some warm - blooded animals such as bears, rodents etc. hibernate during extreme weather seasons and unfavorable conditions. During hibernation these animals live off of stored body fat and can drop their body temperatures significantly.