Where do bats hibernate?
As autumn turns into winter, bats are on the lookout for a comfy roost - a nook or cranny they can hibernate in over winter. You might think all bats hang out in caves but around three quarters of UK bats have evolved to roost in trees.
They are not able to bore holes or build nests, so they make use of whatever gaps they can find.
They like to roost in mature and veteran trees that are hollow from natural decay or have had cavities bored into them by other species, like woodpeckers.
Because of a lack of suitable and available tree habitat, the rest tend to favour man made structures. You might even find them wedged into holes in an old brick wall or set up in the roof of your house. Old barns and abandoned buildings are favoured spots to roost in.
Caves and old mine shafts can also provide good conditions for bats to winter in, as long as they have a constant temperature and are free from damp and frost.
Trying to keep warm, bats will crawl into small rock crevices, squeezing themselves into odd positions, including lying on their backs or sides, or even on their heads!
Six of our favourite bat species
Bats represent almost a quarter of all UK mammals. We have some 18 species of bat, 17 of which breed on the British mainland. Remarkably some species can live for more than 30 years. Here are six UK bat species looking to keep snug over winter.