system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How do bats know which click is theirs when using echo-location?

Watching the caves episode of Planet Earth on Netflix and in the scene about bats there are thousands of them flying about in the cave. I understand how echo location basically works ( I think ), but when the bat sends out its 'click' how does it know the one it hears back is its own and none of the other thousands of clicks?
gpt
Bats change their echo so they know its theirs.

For example some will change the pitch of their echo.

Imagine you are in room of a lot of people and you are trying to talk to someone across the room. You don't get confused as to which voice is taking to you because you focus on the uniqueness of their voice.