The 'Common Pipistrelle' ''Pipistrellus pipistrellus'' is a small
bat. It has a very large range across most of
Europe,
North Africa, southwestern
Asia, and possibly into
Korea. It is one of the most common species in the
British Isles.
It is 3.5-4.5 cm long with a wingspan of 19-25 cm. Its brown fur is variable in tone. It is common in woodland and farmland but is also found in towns, where it roosts in lofts and buildings.
In 1999 the Common Pipistrelle was split into two species on the basis of different-frequency echo-location calls. The Common Pipistrelle uses a call of 45 kHz, while the
Soprano Pipistrelle echo-locates at 55 kHz. Since the two species were distinguished, a number of other differences, in appearance, habitat and food, have also been discovered.
Echolocation
The frequencies used by this bat species for echolocation lie between 45-76 kHz, have most energy at 47 kHz and have an average duration of 5.6 ms.
[1][2]

A Common Pipistrelle in flight.
References
★ Database entry includes a brief justification of why this species is of least concern.
1. Parsons, S. and Jones, G. (2000) 'Acoustic identification of twelve species of echolocating bat by discriminant function analysis and artificial neural networks.' ''J Exp Biol''., '203': 2641-2656.
2. Obrist, M.K., Boesch, R. and Flückiger, P.F. (2004) 'Variability in echolocation call design of 26 Swiss bat species: Consequences, limits and options for automated field identification with a synergic pattern recognition approach.' ''Mammalia''., '68' (4): 307-32.