Bats

There are 17 species of bat in the UK, all of which are protected by law because their numbers have decreased so dramatically. The majority of our bat species are either endangered or actually threatened by extinction. This threat is very real: the mouse-eared bat was declared extinct from Britain in 1991.
Bats hibernate during the winter and become active in April and May when they hunt in scrubby habitats, woodland and around areas of water. All British bats are active at night and are insect eaters.

Habitats

During the day they can be found sheltering in all sorts of places, the 3 main types of roost are buildings (including structures), caves (and other underground places) and hollow or damaged trees. Bats may breed, hunt, and hibernate on trackside land.
Bats can find shelter in any space greater than 12mm wide, including under roof tile, behind fascias, under weather boarding, inside cavity walls etc.