Snail Sex Tape
Radiolab
03/06/26
•29m
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In this episode, we consider a creature we often don’t think much about—the snail. And not just snails, but their sex lives. Which, as it turns out, is epic. There is persuasion and subterfuge, spaghetti penises and co-copulation. And this very surprising habit—erm kink—of making tiny arrows (actually!) and stabbing each other with them. Known as a “love dart,” these limestone daggers aren’t just a strange trick of nature—they have a deep evolutionary purpose.
Special thanks to Menno Schilthuizen and Aaron Chase.
EPISODE CREDITS:
Hosted by - Molly Webster
Reported by - Molly Webster
Produced by - Mona Madgavkar, Annie McEwen, Molly Webster
Sound design contributed by - Mona Madgavkar, Annie McEwen
Fact-checking by - Diane A. Kelly
and Edited by - Alex Neason
EPISODE CITATIONS:
Videos -
A love dart being DARTED! (https://zpr.io/rYhLwXhaxQQP) – Molly has watched this video so many times
Articles -
- Changes in the reproductive system of the snail Helix aspersa caused by mucus from the love dart. (https://zpr.io/xxjuCcTyiVJV) by Koene JM, Chase R. J Exp Biol.
- The snail's love-dart delivers mucus to increase paternity. By Chase R, Blanchard KC. Proc Biol Sci.
- A love-dart at the heart of sexual conflict in snails (https://zpr.io/X2ANHPaEg5sr) by Foote C
** This article has an image of eight different love darts, and it’s what Molly shows to Soren in the episode (this image is one of her favorite research finds!)
Books -
“Nature’s Nether Regions: What the Sex Lives of Bugs, Birds, and Beasts Tell Us About Evolution, Biodiversity, and Ourselves” (https://zpr.io/ktMvJbZciCdD) by evolutionary biologist Menno Schilthuizen.
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Previous Episode
Black Box
February 27
•65m
In this episode, first aired in 2014, we examine three very different kinds of black boxes—spaces where we know what’s going in, we know what’s coming out, but can’t see what happens in-between.
From the darkest parts of metamorphosis to a sixty-year-old secret among magicians, and the nature of consciousness itself, we shine some light on three questions. But for each, we contend with an answerless space, leaving just enough room for the mystery and magic, always wondering what’s inside the Black Box.
EPISODE CREDITS:
Reported by Tim Howard and Molly Webster
Produced by Tim Howard and Molly Webster
EPISODE CITATIONS:
Radio Show: ABC's Keep Them Guessing (https://tinyurl.com/9r9zmftr)
LATERAL CUTS:
Last year we shared a story on our feed about butterfly researcher Dr. Martha Weiss, and how she befriended a little boy on the other side of the world who wanted to do his own caterpillar memory study.
Martha’s daughter Annie Rosenthal captured the whole adventure on tape and produced a gorgeous audio feature, “Caterpillar Roadshow,” which was first published in the audio magazine Signal Hill.
You can find it on our feed (https://zpr.io/xPdAYXFUMr4s)
–or on Signal Hill’s website. (https://zpr.io/a4bjPKeXJQWK)
Signup for our newsletter!! It includes short essays, recommendations, and details about other ways to interact with the show. Sign up (https://radiolab.org/newsletter)!
Radiolab is supported by listeners like you. Support Radiolab by becoming a member of The Lab (https://members.radiolab.org/) today.
Follow our show on Instagram, Twitter and Facebook @radiolab, and share your thoughts with us by emailing radiolab@wnyc.org.
Leadership support for Radiolab’s science programming is provided by the Simons Foundation and the John Templeton Foundation. Foundational support for Radiolab was provided by the Alfred P. Sloan Foundation.
Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.
Next Episode
Return of the Screwworms
March 13
•42m
If a species is horrible enough, do we have the right to kill it forever?
Seventy years ago, a nightmare parasite feasted on the live flesh of warm-blooded creatures in North America: the screwworm. That is, until a young scientist named Edward F. Knipling discovered a crucial screwworm weakness and hatched a sweeping project to wipe them out. Knipling’s seemingly zany plan to spray screwworms out of planes all over the continent— with US taxpayer money— succeeded, becoming one of humanity’s biggest environmental interventions ever.
Today, screwworms have been gone so long that none of us in North America even remember them. But now, they’re coming back. And they’re forcing us to ask: in an era of climate change and rapid mass extinction— should we kill off a species on purpose?
Special thanks to James P. Collins, Max Scott, Amy Murillo, Daniel Griffin, Phil Kaufman, Katie Barnhill, Arthur Caplan, Ron Sandler, Yasha Rohwer, Aaron Keefe, Gwendolyn Bogard, Maria Sabate, Meredith Asbury, and Joanne Padrón Carney
EPISODE CREDITS:
Reported by - Sarah Qari
with help from - Latif Nasser
Produced by - Sarah Qari
Sound design contributed by - Sarah Qari
Fact-checking by - Emily Krieger
EPISODE CITATIONS:
**The latest information on screwworm outbreaks and precautions:
screwworm.gov
Videos:
- Oral history interviews of Edward F. Knipling: here (https://zpr.io/njhMedFN5jsZ) and here (https://zpr.io/VQReQbfznCrq)
Podcasts:
- Here’s a Spotify playlist (https://zpr.io/PNMEM274G7vh) of all of our Golden Goose-inspired episodes!
- Sam Kean’s podcast The Disappearing Spoon – his episode about screwworms is called The Screwiest and Perhaps Most Original Idea of the 20th Century (https://zpr.io/UYf6dR2yG3eN)
- Our episode on CRISPR & gene drives (https://zpr.io/UYf6dR2yG3eN)
- New to Radiolab? Check out our Radiolab Starter Kit (https://zpr.io/QpPnrHAZVQLR) playlist of all-time favorite episodes!
Articles:
- Sarah Zhang’s latest piece in The Atlantic: American Milk Has Changed (https://zpr.io/xebbdq2MWV4L)
- Her most recent piece on screwworms: The ‘Man-Eater’ Screwworm Is Coming (https://zpr.io/ECmjCs7ScbS4)
- Her initial reporting on screwworms: America’s Never-Ending Battle Against Flesh-Eating Worms (https://zpr.io/PNMEM274G7vh)
- Gregory Kaebnick’s paper (https://zpr.io/yqNC3q5FbCcq) about screwworm eradication in Science
Archival materials:
- The USDA’s Screwworm Eradication Records (https://zpr.io/dY7zuVdGYKjf) contain lots of cool images and letters
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