Contact: Robert Sanders
University of California - Berkeley
Caption: A male Anna's hummingbird caught during a display dive, compiled from high speed video. At the bottom of the dive, the bird flares its tail for 60 milliseconds. The inner vanes of the bird's two outer tail feathers vibrate in the 50 mph airstream to produce a brief chirp.
Credit: Christopher J. Clark and Teresa Feo/UC Berkeley
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Related news release: Anna's hummingbird chirps with its tail during display dives