Hummingbird feeders are a beloved pastime for millions of backyard birders and a convenient dining spot for the birds. But for the Anna’s hummingbird, a common species in the western United States, feeders have become a major evolutionary force.⁠ ⁠ According to research published last year, artificial feeders have allowed the birds to expand their range out of Southern California up to the state’s northern end.⁠ ⁠ They have also driven a transformation of the birds themselves. Over just a few generations, their beaks have dramatically changed in size and shape.⁠ ⁠ Learn more on #NationalHummingbirdDay: scim.ag/4jMUmNu