 The idea behind this alternative roosting could in fact be because of the torpor used by the "Pipistrellus pygmaeus" and the desire of the bat to be around 40 degrees C at certain times of its life, like when in maternity colonies.The Soprano pipistrelle only uses a small portion of its home range in order to forage and it is generally close to its day roost.Possibly because of the preference for foraging in a riparian habitat, many times these bats are seen overlapping each other's foraging areas.