When males perform courtship dives for females, neighboring fluttering tale feathers produce interaction frequencies. In some species, for or five species may interact with one another to produce sounds.
Credit: Anand Varma
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Christopher Clark explains how hummingbirds generate sound with their tail feathers.
Credit: Christopher Clark
The researchers' work is described in the September 9, 2011 issue of the journal Science.
Credit: Copyright AAAS 2011
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