FIG. 3. Video stills showing B in CCTV enables the discovery of new barbastelle (Barbastella barbastellus) vocalisations and activity patterns near a roost

FIG. 3. Video stills showing B. barbastellus activity near the roost, the entrance of which is in the bottom third of the images. The bats are filmed with infrared light. A) A single bat investigates the roost tree, filmed from the side of the roost tree. This bat was moving slowly, and the image is sharp; B) Four swarming bats, filmed facing the roost entrance. As the bats move at speed when swarming, they appear blurred in a single video frame