One of the first signs of spring are the sounds of birds chirping in search of food, nesting grounds, and a potential mate. But sometimes those bird calls aren’t coming from the source you’d expect.

Rather than singing to their mates, Costa's hummingbird males court females with musical, high-speed dives. Their "song" is produced as the wind whistles through their tail feathers. Now, researchers ...

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 ...

A week ago I heard the familiar sound on hummingbird wings while filling bird feeders on our back porch. It happened so fast I had to quickly scan the area and found a female ruby-throated hummingbird ...