The chirps and beeps of hummingbirds at times come from their tails. Subscribe to read this story ad-free Get unlimited access to ad-free articles and exclusive content. Male Anna's hummingbirds — the ...

Berkeley -- The beeps, chirps and whistles made by some hummingbirds and thought to be vocal are actually created by the birds' tail feathers, according to a study by two students at the University of ...