Bats are blind. Bats are rodents. Bats are the only flying mammal. Some species of bats are threatened. Bats cause a high percentage of rabies cases.
Signals reflected back can also provide information on the type and size of a prey item.
Humans can't hear many of the signals bats generate. The game of Marco Polo is a little bit like echolocation. The bat is blindfolded and has to locate each of its prey by sound. Investigate some of the legends about bats. Compare the myths to reality.