Scientists say: Hibernaculum
It’s where some animals go to rest undisturbed over winter
Hibernaculum Singular noun. Hi-buhr-NAHK-you-lum Plural: hibernacula hi-buhr-NAK-yuh-lah
The place or places where animals hibernate. During this rest period, animals drastically slow down their activity to save energy. They may breathe slowly and have a low body temperature and heart rate. They may appear to be sleeping, but hibernation is actually different. Bears and bats may use caves as hibernacula. Rodents such as ground squirrels may use burrows underground.
In a sentence
Diseases such as white-nose syndrome may wait for bats in their hibernacula.
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hibernation A state of inactivity that some animal species enter to save energy at certain times of year. Bears and bats, for example, may hibernate through the winter. During this time, the animals move little, and their bodies’ use of energy slows dramatically. This eliminates the need to feed for months at a time.