Western Pipistrelle

Pipistrellus hesperus

Western Pipistrelle

Pipistrelles are the smallest American bat; only about 3” long

Family:
Vespertilionidae
Description:
A small bat with yellowish or dull gray fur on back, whitish below weighs 3-5 grams
Track:
Size:
Habitat:
Common in open arid areas at lower elevations; hibernates in caves but may emerge occasionally in winter; solitary or in small colonies.
Range:
Throughout CA; from central Mexico north to WA and east to OK
Food:
Emerges in early evening, long before sky is dark; also flies at dawn. Flies close to the ground feeding on small moths, beetles, and dipterans.
Breeding:
Usually two young born in June; some in nursery colonies.
Comments:
Ears: Short and darkly pigmented. Because it emerges early in the evening, this bat is often seen. It can be recognized by its rather erratic flight pattern.