The proliferation of hummingbird feeders has become a “major evolutionary force” for the Anna’s hummingbird species in the western US. “Over just a few generations, their beaks have dramatically changed in size and shape.”
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Comments 1
So interesting. Thanks for this one, Jason.
We have a lot of Anna’s Hummingbirds around our place in the Sierra Nevada. We would probably have feeders if it weren’t for the bears. I’ll be looking at the hummingbirds more closely this Summer!
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