Genus Eptesicus is a group of bats commonly known as the serotine bat. The serotine bat is found in many regions across the world, including Europe, Asia, Africa, and Australia. As with most animals, the various species of Eptesicus are known by different names in different regions. Some common synonyms for the genus Eptesicus include brown bat, pipistrelle bat, and evening bat. The genus belongs to the family Vespertilionidae, which is the largest family of bats. Despite being often perceived as spooky or frightening, bats are essential to the ecosystem and play an important role in pollination, pest control, and the spread of seeds.