|Global range of P. pygmaeus (green)|
The two species were first distinguished on the basis of their different-frequency echolocation calls. The common pipistrelle uses a call of 45 kHz, while the soprano pipistrelle echolocates at 55 kHz. The two species are sometimes called the 45 kHz pipistrelle and the 55 kHz pipistrelle, or the bandit pipistrelle (common) and the brown pipistrelle (soprano). Since the two species were split, a number of other differences, in appearance, habitat and food, have also been discovered.
- Parsons, S. & Jones, G. (2000). "Acoustic identification of twelve species of echolocating bat by discriminant function analysis and artificial neural networks". The Journal of Experimental Biology 203 (Pt 17): 2641–56. PMID 10934005.
- 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. doi:10.1515/mamm.2004.030.
- ARKive Pipistrellus pipistrellus and Pipistrellus pygmaeus Photographs and videos.
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