Movie 1.

Multiple views of tail flaring by a male Calliope hummingbird (Selasphorus calliope) 16 displaying to a male on the high perch (desired resource) in our contest arena. The displaying 17 male (Bird 3 in the main manuscript) regularly displaced competitors and secured the high perch 18 in competitions. Original video sampled at 2000 frames s^-1, with playback at 200 frames s^-1.