If you were a bat hunting for food at night, how would you find a meal? Echolocation! All bats in Illinois use echolocation, a kind of bat radar, to locate and zoom in on their prey. They emit a pulse of sound at a high frequency that is inaudible to humans. The bat listens for echoes bouncing off objects to determine an item’s distance, shape, size and even surface texture. If all these clues add up to food, the hungry bat swoops in to catch its prey.