While recognition of two species among pipistrelles communes (Pipistrellus pipistrellus and Pipistrellus pygmaeus) dates back over 10 years, discrimination morphological of both species is not always obvious, see sometimes even difficult.
Wakati utambuzi wa aina mbili katika pipistrelles ya kawaida (Pipistrellus pipistrellus na Pipistrellus pygmaeus) ulianza zaidi ya 10 miaka, Kubadilika kwa maumbile ubaguzi wa aina mbili daima si dhahiri, wakati mwingine vigumu kuona.