A period of dormancy in winter. During hibernation the animal's body processes drop to a low level 
Many species of mammals hibernate, such as the dormice, northern bears, bats, etc. .
|This article is part of Project Glossary, a All Birds project that aims to write comprehensive articles on each term related to animals.|
|This article is part of Project Animal Behaviour, a All Birds project that aims to write comprehensive articles on each term general related to animals.|
Compare with torpor, which is similar.
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