Luxembourg, August 2017

A camping trip to Luxemburg was enjoyable for wildlife, in a surprisingly forested country. Bats around the campsite were dominated by Common Pipistrelle, but each evening a flyover was being picked up on the detector. Took  a while to come to a conclusion, but the fairly regular chip-chop calls , with frequencies of 23Hz to 31Khz over open sky suggests Leisler's is most likely.