Wings under Wyoming - news story - 03 May 2013
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The Green River Formation of Wyoming is famous for its fish fossils. It was a series of lakes in the Eocene and its limestones throw up fish by the trailerload, but now and again fossil hunters turn up something more unusual. Rays, turtles, bats and even a three-toed horse have been found, as well as a few species of bird.
Now a bird has been found that looks to be an ancestor of swifts and hummingbirds. The feathers of Eocypselus rowei are unusually well-preserved, allowing researchers rare insight into wing structure. You can read more by clicking here.