When birds make noise, it's not always with their throats. In hummingbirds and manikins, for example, special feathers flutter and vibrate to produce tones and whistles, which impress potential mates and scare off competitors. Now researchers have found that pigeons use wing noise to warn the flock about approaching enemies--the first example of a nonvocalized alarm call in birds. Not all birds make vocal calls to alert companions, so behavioral ecologist Robert Magrath of the Australian National University in Canberra wondered whether they use flight sounds instead.Read More.........
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