hybernation
its usually a cave or close to a cave
no
what
They are called Hibernators :D
Dung beetles and some other insects hibernate through summer and winter for cold and hot temperatures kill them.
A bear.
sleeping
eh? To hibernate is to sleep through the cold winter months. Cold blooded animals are called Ectotherms/Ectothermic and warm blooded animals are called Endotherms/Endothermic.
Hibernation
Mainly squirrels sleep right through to the early days of spring.
Some animals sleep through the winter -- those animals are called hibernators. The long sleep through the winter is called hibernation.
Some animals such as bears go into a state of dormancy called hibernation during the winter. They reduce their metabolic rate and conserve energy by sleeping for extended periods. Hibernation helps these animals survive the cold and scarce food resources during the winter months.