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Archilochus alexandri (black-chinned hummingbird)
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
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