Apart from the harp-traps there are other methods to catch bats for recording their calls as reference for our bioacoustics project . Fine nylon mesh nets can be set in preferred foraging areas of bats. Setting these mist-nets in narrowing passageways will often increase catching success.
Nets have to be attended constantly to release caught bats as quickly as possible.
Mist net in the evening sky. Release of a bat from a mist net, which was set over a forested river. Access to these and many other foraging sites was only made possible through the help of many anonymous voluntary coworkers.