Bird Feeders Have Caused a Dramatic Evolution of California Hummingbirds
Science magazine reports that hummingbird feeders have become a major evolutionary force. (At least for the Anna’s hummingbird, a common species in the western U.S. Over just a few generations, their beaks have dramatically changed in size and shape…. [A]s feeders proliferated, Anna’s hummingbird beaks got longer and larger, which Read more…






