An up-to-date guide to these fascinating mammals which details their biology, diversity, evolution, natural history, behaviour, and ecology, as well as their interactions with humans and folklore. These tiny, harmless mammals are frequent visitors to our homes and gardens yet, due to their speed, size and habits, are extremely difficult to get a good look at and are little understood. Focuses on the Pipistrelle, Noctule and Long-eared Bat in detail, with many other unusual and charismatic species also described.