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NSF-, media Contacts, lily Whiteman, National Science Foundation, (703) 292-8310, email: Program Contacts, william Zamer, National Science Foundation, (703) 292-7894, email: Principal Investigators, christopher Clark, Yale University, (510)220-1891, email: The National Science Foundation (NSF) is an independent federal agency that supports. Whistles are produced by purely aerodynamic mechanisms. The sound recordings used to create these spectrograms are available in the electronic supplementary material. Third, laboratory experiments can demonstrate that particular feathers are sufficient to produce sounds similar to the flight sounds.

As a result, during flight, all birds, including owls (. It is not a sleep aid. Apple or, android device.

Of the R5 tail feathers must be present for the birds to produce the dive sound. Many descriptions of tonal flight sounds call them whistles, but intend this as a description of the sound's tonality ( Bostwick 2006 without specifying an underlying whistle mechanism. How can they help?