The male club-winged manakin (Machaeropterus deliciosus) uses dance and sound to attract the ladies but he doesn’t open his mouth.  He uses his wings!

Watch and listen as he bows and flares.  The loud buzzy noise is made by his secondaries.  Cornell Lab writes:

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.

Ornithologists have known for a long time that the males’ secondary feathers are deformed.  This 1871 drawing shows the difference between the males’ deformed and the females’ normal feathers.

Now that we have high definition video we can see why they’re like that.  He makes his feathers sing.

p.s.  Click here for the location of secondary wing feathers.

(video from Cornell Lab of Ornithology on YouTube. Illustration from Wikimedia Commons; click on the image to see the original.)