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This is Scientific Americans 60 Second Science.

I'm Jason Goldman.

Each night, small groups of a species called velvety-freetail bats emerge from their roosts in the Panamanian rainforests to hunt for their insect prey

using echolocation.

When bats are hunting, especially when they're in open areas, they produce two really distinct

call types.

So they have their search phase calls when they're just scanning the environment.

And then they have feeding buzzes when they actually detect prey like an insect swarm.

Jenna Kohl's, a graduate student at the M Mox Planck Institute of Animal Behavior in Germany.

Both types of calls are typically too high-pitched for us to hear,

but other bats can eavesdrop on those feeding buzzes and use them as a cue for finding food.

And it's always been assumed that the other calls, search phase calls,

don't include that kind of social information. But Coles on her team wondered if search phase calls

might also be social and help bats stick together in the dark. This is why we then tested,

first whether these echolocation calls that they produce when

their skin in the environment kind of contain information about a bat's identity, like in the form

of an individual signature. And then, more importantly, we wanted to test whether bats can actually

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