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This is Scientific American's 60-second science.

I'm Christopher in Talata. Got a minute?

What you're listening to is what I like to call the beautiful chaos of the bat echolocation streams.

Laura Klepper, a bioacoustician at St. Mary's College in Indiana.

So you're listening to the sounds of probably a couple hundred bats emerging per second

from the cave, and there's a microphone that we have suspended in the middle of the bats

to record the sounds.

These are the echolocation sounds that the bats make when they're flying, and this is what

they use to help navigate and find prey.

The sounds, which are slowed down ten times so we can hear them, were recorded at a network

of lava tube caves in New Mexico.

Klepper and her colleagues had camped out there to study how Mexican freetailed bats echo locate in huge swarms

without jamming each other's signals. And they noticed that the intensity of the bleeps seemed to

correlate with the number of bats fluttering out of the cave, meaning maybe you could survey their

populations with audio. It was one night we were sitting around the campfire at our field site and we said, you know,

I wonder if, I wonder if this would actually work.

...