People have always been puzzled by how bats see small insects in the dark, and how they avoid bumping into things as they fly around in the dark. Two hundred years ago an Italian, called the Abbe Spallanzani, made an experiment to find how they did it. He caught a lot of bats and covered their eyes with wax so they could not see. Then he let them loose in a room in which many bells were hanging on wires. If a bat touched a wire the bell would ring. But the bats flew to and fro in the room and avoided all the wires.

The Abbe was puzzled. He was sure only that bats had some special sense. This special sense was only recently discovered when scientists found out that bats hear their way about. Their eyes are small and weak, but their ears…



Source by David Bunch