We welcome young and old with a presentation about the life of our bats. After the presentation, we will go on a treasure hunt in the dark with a bat detector, a device that makes the ultrasonic sonar of these animals audible. Will you come and listen? To the Daubenton's bat, the Natterer's bat, the brown long-eared bat, or the Daubenton's bat. Daan will take the adults in tow, Linda will bring the children closer to the bats.