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hibernaculum (noun) -

: a shelter occupied during the winter by a dormant animal (such as an insect, snake, bat, or marmot)

Source : Merriam-Webster

Etymology : If you’re afraid of snakes or bats, you probably won’t enjoy thinking about hibernacula, where hundreds, even thousands, of these creatures might be passing the wintry months. Other creatures also use hibernacula, though many of these tend to be less crowded. The word hibernaculum has been used for the burrow of a hedgehog, for instance, as well as for a cozy caterpillar cocoon attached to a wintry twig, and for the spot in which a frog has buried itself in mud. Hibernacula are all around us and have been around for a long, long time, but we have only called them such since the late 1700s, making hibernaculum only a few decades older than the more familiar verb hibernate. Both words come from the Latin verb hibernare, meaning “to pass the winter,” which in turn comes from hibernus, meaning “winter.”

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