Intro

Most bats use echolocation to navigate and hunt, but some use their ears for another trick: eavesdropping.

"And then these frog-eating bats, for example, they are actually listening in on the mating calls of frogs that are much, much lower in frequency," says behavioral ecologist Rachel Page.

But how the bats knew this eavesdropping trick was a mystery. So she set up and experiment with baby bats and a speaker.

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