Where Do Bats Hibernate?

Every species of bat has a preference for a particular temperature in hibernation. They choose the site, called a hibernaculum, based on this need. All bats need a fairly humid environment to prevent them from drying out during the long winter hibernation. Often this is obvious from drops of water which accumulate on the skin and fur of hibernating bats. There are three main groups with similar hibernation choices. Horseshoe bats are typical of those species that like to hang freely from the ceiling or a wall by their hind feet. Daubenton's bats will select a similar environment but require the presence of crevices into which they can crawl if the main environment starts to become less suitable for their needs. The pipistrelle is typical of the third group which likes small enclosed spaces, preferably allowing their body to be in contact with a wall on all sides. Caves, cellars and tunnels are the most likely places to find a combination of high humidity and small crevices. Roof spaces which are happily used for breeding and roosting are not so suitable for hibernation.