Anna's hummingbird chirps with its tail during display dives

The beeps, chirps and whistles made by some hummingbirds and thought to be vocal are actually created by the birds' tail feathers, according to a study by two students at the University of California, Berkeley.

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<p><a href="http://www.physorg.com/news120894475.html">Anna's hummingbird chirps with its tail during display dives</a></p> <p>The beeps, chirps and whistles made by some hummingbirds and thought to be vocal are actually created by the birds' tail feathers, according to a study by two students at the University of California, Berkeley.</p>