Night falls, and a strange ballet begins! Bats leave their refuge and flit silently about in search of their favourite food.
But how do they find their way in the dark? Quite simply by calling out! They produce ultrasonic sounds (inaudible to the human ear) that bounce off obstacles, showing them the way. They cannot tolerate daylight, so at the first rays of sun, they nestle in the hollow of a tree, a rock or even in our attics!