JOHN SIBBICK / SCIENCE PHOTO LIBRARY JOHN SIBBICK / SCIENCE PHOTO LIBRARY
Magpie and dinosaur foot, conceptual illustration. The magpie is an example of modern birds, all of which evolved from feathered dinosaurs. The dinosaur foot shown here is that of a large theropod (the group that included dinosaurs such as Tyrannosaurus rex). Such dinosaurs were bipedal and had four toes (one backwards pointing), the same as modern birds. Birds are modern examples of extant (still-living) theropods, and have the same basic foot anatomy. The dinosaur shown here became extinct long before humans and modern birds evolved.
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