I thought this article might be interesting to people in this group:

"It’s common knowledge that bats navigate and search for their prey using echolocation, but did you know that the ultrasonic chips made by different species of bats are distinct enough that they can be used for identification? [TegwynTwmffat] did, which is why he came up with this impressive device capable of cataloging the different bats flying around at night."

Link