More than 60 million years ago, an asteroid hit the Earth, wiping out nearly all the dinosaurs. The only dinosaurs to live through this mass extinction were birds. In this episode, we look at how these ancient creatures learned to listen and communicate, and how listening to birds has changed us.

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Operation frog sound! Send us your frog sounds for an upcoming episode. We want you to go out, listen for frogs and toads, and record them. Just find someone croaking, and hit record on your phone. It doesn’t matter if there’s background noise. It doesn’t even matter if you’re not sure whether or not you’re hearing an amphibian—if you think you are, we would love to get a recording from you.

Please also say your name and where you are in the world, and then email the recording to us at [email protected]