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Does a Robin Hear Its Worm?

See it, smell it, feel a vibration, or… ?
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American Robin listening for worm under the ground
© Dan Streiffert

How does a robin know a worm is in one exact spot? Does it see the worm or hear it? Smell it? Sense its movements through its feet? To find the answer, researchers buried worms in soil in a tray. They covered the soil with a thin but opaque sheet of cardboard, followed by more soil, so the robin couldn’t see the worms. Still, the robin found them with ease. The scientists concluded the birds are listening for their prey. There’s always more to learn about birds!

If you ever miss a BirdNote, you can always get the latest episode. Just tell your smart speaker, “Play the podcast BirdNote.”

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BirdNote®

Does a Robin Hear Its Worm?

Written by Bob Sundstrom

This is BirdNote.
[American Robin call]
As a robin hops across a lawn or garden, it cocks its head to one side and then the other. A moment later, it jabs its yellow beak to the earth and comes up with an earthworm.
[American Robin call, https://search.macaulaylibrary.org/catalog?taxonCode=amerob&behaviors=c…, 0.09-.10]
How did the robin know a worm was in that exact spot? Did it see the worm or hear it? Smell it? Or sense its movements through its feet? 
[American Robin call, http://macaulaylibrary.org/audio/133356, 0.41-.45]                        
Experiments with captive robins first determined the birds weren’t smelling worms or sensing their vibrations. So the birds must have been seeing or hearing them, right? To learn more, researchers buried worms in soil in a tray. They covered the soil with a thin but opaque sheet of cardboard, followed by more soil, making it impossible for a robin to see the worms. Still, the robin effectively found the worms!
[American Robin call, https://search.macaulaylibrary.org/catalog?taxonCode=amerob&behaviors=c…, 0.09-.10]
The scientists concluded that robins are successfully listening for their prey, even if they can’t see, smell or feel it. [American Robin song, http://macaulaylibrary.org/audio/168300, 0.7-.11]
For BirdNote, I’m Mary McCann.
[American Robin song, http://macaulaylibrary.org/audio/168300, 0.7-.11]
If you ever miss a BirdNote, you can always get the latest episode. Just tell your smart speaker, “Play the podcast BirdNote.” Learn more on our website, BirdNote.org.
                                                             ###
Producer: John Kessler
Executive Producer: Sallie Bodie
Editor: Ashley Ahearn
Producer: Mark Bramhill
Associate Producer: Ellen Blackstone
Bird sounds provided by The Macaulay Library of Natural Sounds at the Cornell Lab of Ornithology, Ithaca, New York. ML133356 AMRO  Recordist G Keller, 0:05 - 1:10. ML168300 AMRO  Recordist W Hershberger, 1:10 - end.
BirdNote’s theme was composed and played by Nancy Rumbel and John Kessler.
© 2020 BirdNote   August  2020   Narrator: Mary McCann

ID# AMRO-18-2020-08-20            AMRO-18
Source: http://web2.uwindsor.ca/courses/biology/dmennill/360/article.pdf
http://www.loe.org/shows/segments.html?programID=13-P13-00018&segmentID…
https://www.lib.montana.edu/acoustic-atlas/acoustic-atlas-blog/posts/ca…

Bob Sundstrom
Writer
Mary McCann
Narrator
Dan Streiffert
Photographer
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American Robin — More at the Audubon Guide to North American BirdsAmerican Robin - More at All About Birds

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