Study details evolutionary change of Anna’s hummingbirds and finds ranges have expanded to follow such devices
Which came first: the feeder or the bird?
A seemingly straightforward question, but the answer might not be so simple. According to a recently published study in Global Change Biology, the use of human-made hummingbird feeders has changed the beak sizes and shapes of Anna’s hummingbirds, and spread their range from a narrow pocket of California all the way up the coast to British Columbia.
