![High-speed courtship dive of the Anna's Hummingbird High-speed courtship dive of the Anna's Hummingbird](https://biology.berkeley.edu/sites/biology.berkeley.edu/files/styles/large/public/images/research/clark2.jpg?itok=OXFTdwYF)
Male Anna's Hummingbirds perform a spectacular courtship dive to females, at the bottom of which they abruptly produce a loud "CHIRP" sound with their tail-feathers. The image was created from a high-speed video; each image is 0.01 seconds apart.
Image courtesy of Christopher James Clark