More than 60 million years ago, an asteroid hit the Earth, wiping out almost all the dinosaurs. But one group made it through—the ancestors of birds. In this episode, we look at how these ancient creatures learned to listen and communicate, and how listening to birds has changed us.Threshold is nonprofit, listener-supported, and independently produced. You can support Threshold by donating today. To stay connected, sign up for our newsletter.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] in this episode:Threshold is listener-funded.To keep making this work and sharing it with audiences for free, we have to raise $75,000 by the end of the year — and we’re over 80% of the way there! If you haven’t chipped in yet, consider making a gift today.
Giving TuesdayTo continue making Threshold and sharing it with audiences for free, we need to raise $75,000 by the end of the year. Thanks to your support, we are 80% of the way there! If you haven’t chipped in yet, please consider supporting our work by donating today.

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