A wonderful moonlit batwalk  in Handsworth Park last night, led by Lucy from the RSPB. Below is a recording of of some of the bats we heard, using  bat locators – the bats use echo location to hunt their pray, emiting high pitched sounds which bounce back off the moths and midges, enabling the bats to hear (rather than see) what they are hunting. The bat sounds, too high to be heard by the human ear, are made lower by the bat locator, which is what you can hear below: