The story so far!
I started looking for bats about 7 years ago. Armed with a fairly basic heterodyne Bat Detector I soon started to pick up the commonest species around Milton Keynes (Common Pipistrelle, Soprano Pipistrelle and Noctule, plus the occasional Natterer's and Daubenton's). I then joined up with the North Bucks Bat group, and took part in some organised surveys before moving to my present house in Hampshire. Nowadays, I have a much better detector (a Pettersson D230 frequency division detector) which lets me listen to the heterodyne signal in one ear whilst recording Frequency division in my other ear (and to a recorder for further analysis). My samples of the typical echolocation of some UK species are below together with sonograms, and power spectrums: Common Pipistrelle Soprano Pipistrelle Nathusius' Pipistrelle Barbastelle Serotine Noctule Whiskered/Brandt's Brown Long Eared Bat, Natterer's and Daubenten's to be added. Plus some more exotic