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 ...

It’s a cold, foggy February morning, and Bev LaBelle is on the hunt for hummingbirds. Walking along a trail in Southeast Portland’s Oaks Bottom Wildlife Refuge, she pauses as a flicker of movement ...