The places in which an animal hibernates or overwinters; winter quarters (Morris 1992).

places where bats or other animals hibernate, or sleep, during the winter to conserve energy.

shelters occupied during the winter by dormant animals

A protective, secure residence, such as a cave or burrow, of an animal that spends time in a dormant condition.

A secure area, usually a cave or a den of some sort, used by hibernating animals while in a state of torpor. Most hibernacula are dark and secluded so as to keep the hibernating animal out of harms way from predators or human disturbance.

A general term used to describe any site natural or manmade which is suitable for bats bats to hibernate in. Many factors dictate how significant a hibernacula may be including but not limited to: temperature, humidity, disturbance, airflow, physical characteristics, surrounding habitat, and number of species present.