First bats of the year

Not having any joy picking up bats in the garden with the detector so far this year, so I ventured out around the village. Started pretty quiet, but I was soon recording Common Pipistrelles, and on checking the recordings, a Soprano Pipistrelle also sneaked past.

in the screenshot, the Common Pipistrelle are the heavy Hockey stick shaped calls, the bottom of the call corresponding to the peak frequency of ~45Kz. These bats were hunting in a semi-cluttered environment, along a line of tall bushes.
The first, faint call, is a Soprano Pipistrelle, at 54KHz. Call is flatter, constant frequency with longer gaps between the calls. Presumably this bat was passing thru, further away, in the open, thus not needing the full spectrum of calls.

The smudge of calls in the middle is a Common Pipistrelle social call.