January 30, 2008

Solving the Hummingbird's 'Chirp'

If Anna's hummingbirds chirp with their tail feathers, would that also be true of other species whose males make similar display flights?

1 comment:

Steve Bodio said...

Nighthawks (which of course are not hawks) "boom" with their feathers when courting. Snipe and woodcock also sing with their wing feathers during courtship.