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Birds can use their feathers for much more than flight. In some species, for example, they produce sound. The secondary wing feathers of the male Club-Winged Manakin, a bird from South America, are large and rigid. He strikes them together at about 107 times per second to create a buzzing sound, which is used during courtship displays.
This video accompanies Chapter 4, Feathers and Plumages, Handbook of Bird Biology 3rd Edition from the Cornell Lab of Ornithology and Wiley Publishing.
birdbiology.org
Timothy G Laman/Cornell Lab of Ornithology/Macaulay Library/458515