Do little brown bats and big brown bats use their sonar?

Answer 1

All bats use a sonar called 'echo-location'. Bats use this when they are hunting often in the dark (e.g. sunset, night) so that they can detect obstacles (e.g. trees, insects) that are in their flight path. Bats also use this to hunt down their prey (e.g. moths) and get an accurate location. The bats use this by sending out a super sonic squeak that human ears cannot hear and that squeak will bounce off obstacles and transmit back to the bat.