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Territorial Twitters

birdsong.jpg
The male song sparrow, Melospiza melodia, is angry. He swoops from branch to branch, jumping up and down, vibrating his wings, searching for the loud-mouthed intruder in his territory. Every so often, he sings softly, a highly aggressive response song intended only for the intruder.

But the intruder is not deterred. It's Bill Hoese of Cal State Fullerton. Bill has placed a speaker in the thicket below and broadcast a territorial intrusion call. When you study bird song for a living, sometimes you have to fool the birds.

Alli, an 11th grader at El Camino Real High School, holds a parabolic microphone pointed at the action. "The bird sounded like it was right here chirping at my shoulder!" Listen for yourself!


Photograph by Doug Meyer, audio recording by Bill Hoese

POSTED BY EMILY LANDIS/BIOBLITZ TEAM, 8:35 PM PDT

 

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To celebrate biodiversity and America’s parks, National Geographic is sponsoring and helping to host one BioBlitz each year through 2016, the centennial of the U.S. National Park Service. Join us in person if you can, or experience the events online and share your thoughts on our living chronicle, the BioBlitz blog.

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