Bats are unique animals as they are the only mammals that move by echolocation. There is a general agreement among bat scientists that bats tend to turn left when leaving a cave. This has been explained to be so because bats generally move by sensing echoes and thus in order to get out there should be a system to avoid collisions. However this assertion is also contentious but as stated, the one unique thing about bats is in the way they sense direction when leaving caves.