Feather Fluttering Sounds (AUDIO) Field Museum Your browser does not support the audio element. Caption Recording of the sounds made when the flycatchers flutter their wing feathers-- the high-pitched buzzing/chirping sound is what the researchers were interested in. (We've got more where this came from, if you'd like to compare the sounds made by different subspecies.) Credit (c) Valentina Gómez-Bahamón, Field Museum Usage Restrictions Please include credit: (c) Valentina Gómez-Bahamón, Field Museum License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.