Radar was an amazing technological breakthrough when it was developed during World War II, but for bats, it was old stuff.
The only basic difference between man's radar and bats' "echolocation" is that radar locates objects by sending out a radio signal and listening for an echo, while bats send out sound waves.
Bats are the only mammals to fly and are enormously widespread and varied. There are 900-plus species of bats -- from the five-foot-wingspan flying fox, to the little bumble bee size "Kitti's hog-nosed bat" of Thailand.
Most bats eat flying insects, some eat fruit, a few fish, and others eat other bats, frogs and rodents. And despite its fearsome name, the vampire bat bites livestock, almost never people.
