Pipistrellus subflavus is a species of bat commonly found in the eastern United States. This small bat, also known as the Eastern pipistrelle, has several synonyms that describe its physical appearance and geographic location. Some common synonyms include the Golden brown bat or the Tri-colored bat, referring to its unique combination of brown, yellow, and gray fur. Others include the Eastern pipistrelle bat, Northern yellow bat, and Southern yellow bat, depending on its range within the United States. Despite these various names, Pipistrellus subflavus is a vital species in the ecosystem, known for its insect-eating habits and important role in maintaining balance within local ecosystems.