the biological sonar,or echolocation,of bats and a number of other animals is one of nature's great ingrnuities. as a means of perceiving the enviroment by bouncing high frequency sunds off objects,it interests scientists in many disciplines.echolocation serves the bat as a substitute for vision in the perceprion of near and moderately near objects. bats can examine the chaeacteristics of objects-size,shape,distance,direction,and motion-by sensing the way the objects