A male Black-Chinned Hummingbird (Archilochus alexandri) vocalizes as he feeds. Note the sound of the "hum" from his wings. Analysis of this hum indicates his wingbeat frequency is 51 beats per second!
Douglas Von Gausig (recordist; copyright holder), Naturesongs.com
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported License.