The sound of fear: Why so many animals scream

October 13, 2026

AI Summary

5 min read

The sound of fear: Why so many animals scream

One day, UCLA behavioral ecologist Dan Blumstein was holding a baby yellow-bellied marmot he had trapped for research. The animal let out a sound that shocked him so much he almost dropped it. "I had this emotional response to the scream," Blumstein recalls. That moment launched him into a decades-long investigation of what makes screams so universally unsettling—and why they work the same way across species, from marmots to humans.

What a scream actually is

Blumstein has been leading one of the world's longest-running experiments on a wild species: yellow-bellied marmots at a site in southern Colorado, studied continuously since 1962. These cat-sized rodents normally make a sound like a smoke alarm when they sense danger—a steady, repetitive chirp that tells other marmots something is going on. But that's not a scream.

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What you'll learn

1 The sound of fear: Why so many animals scream
2 (00:25) **Halloween intro & the sound of fear** - Hosts Regina Barber and Nate Rott set up the episode's spooky theme: the science behind frightening sounds
3 (02:08) **The yellow-bellied marmot research** - Dan has led one of the world's longest-running experiments on a wild species since 1962
4 (03:48) **The scream that changed everything** - Dan heard a marmot scream that was fundamentally different from normal alarm calls
5 (05:29) **What makes a scream a scream** - Screams occur when mammals overblow their vocal folds, creating non-linear sound attributes
6 (07:45) **Non-linear attributes across species** - These acoustic irregularities appear in screams across the animal kingdom
7 (08:56) **The biological reason for screams** - Screams are evolutionarily designed to be impossible to ignore

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Show Notes

It's Halloween season — and what better way to celebrate October 13th than to explore the haunting sound of fear? That's exactly what we do in this episode, where host Regina G. Barber and NPR science correspondent Nate Rott dive into the science behind the sound of fear. Along the way, they find out what marmot shrieks, baby cries and horror movie soundtracks have in common — and what all of this tells us about ourselves.

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