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Crows Recognize Individual Faces

The work of John Marzluff

To find out if a crow can recognize an individual human face, Professor John Marzluff of the University of Washington wore a mask while trapping, banding, and then releasing seven American Crows on campus. Later, when he walked through the campus wearing the mask, it was automatic! A big group of birds scolded and divebombed him. He thinks it's a benefit to the birds' survival to point out and recognize challenges in their environment. Watch a video and learn more at ScienceMag.org.

Full Transcript

Transcript: 
BirdNote®
Crows Recognize Individual Human Faces
Featuring John Marzluff
Written by Todd Peterson

This is BirdNote.

[Crows cawing] 

To find out if a crow can recognize an individual human face, Professor John Marzluff of the University of Washington bought a cave man mask. He wore the mask while trapping, banding, and then releasing seven crows on campus. He describes what happened later when he walked through the campus wearing the mask: 

….Man…it was automatic! [Crows scolding] I had a big group of birds on me scolding me and coming at me when I wore that Cave Man mask… you know, they scolded mostly closely to where we had caught the birds initially, but over time, that spread, and we had more and more birds involved scolding us and typically after a couple a years of doing the walking, no more trapping, we would have about 50% of the birds we encounter, scold us…

...so the knowledge that this is a … strange-looking and dangerous face seemed to be spreading through time and space and that suggested pretty strongly that they indeed were keyed in on this face…because when we wore the other mask…or no mask at all, we did not get this sort of response by the birds.

Marzluff and his team conducted more detailed experiments using realistic faces and new locations. They found the birds could identify the threatening people. As for how and why the crows spread the information?

 … I think its one of the, if not THE most important function of a mob….It’s a benefit to survival to point out and recognize challenges in your environment!

Talk about never forgetting a face! [Crows scolding]

###

Call of American Crow provided by The Macaulay Library of Natural Sounds at the Cornell Lab of Ornithology, Ithaca, New York, recorded by G.A. Keller.
Mobbing calls of American Crows recorded by C. Peterson Jul05G12T3&5 Ambient crows Jul05 G21T1
Producer: John Kessler
Executive Producer: Chris Peterson
© 2016 Tune In to Nature.org      March 2013/2016   Narrator: Michael Stein

ID# marzluffj-AMCR-01-2011-03-22 

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