The Western Pipistrelle is a small bat species found primarily in the western regions of the United States and parts of Mexico. It belongs to the family Vespertilionidae and is known for its distinctive, high-frequency echolocation calls. This bat typically has a wingspan of about 22 to 25 centimeters and weighs around 5 to 10 grams. These bats prefer habitats such as deserts, grasslands, and urban areas, where they hunt for insects at dusk. The Western Pipistrelle roosts in crevices, tree bark, and buildings, making it adaptable to various environments. Their population is generally stable, but habitat loss poses potential threats.