Actually, bats aren’t blind – but their eyes are 1 (poor) developed. However, since they often live in darkness, good eyesight 2 (not need). If you were a bat, your way of experiencing the world 3 (be) very different from that of most mammals. Over millions of years, the 4 (necessary) of living in the dark 5 (cause) bats to develop the 6 (able) to use echolocation to build up a picture of their environment. High-pitched noises are made by bats when they 7 (fly), and, 8 (amaze), they collect the information which 9 (create) by their own sounds and use this information to locate objects on their journey. Their reactions depend on the 10 (situate) they are in. A zoologist told me that he had seen horseshoe bats catching moths in the dark as they flew past them. They could sense the delicate movement of an object – in this case a moth’s wings – by using echolocation.