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When Birds Had Teeth
How did Archaeopteryx relate to today’s birds? Its teeth provide a major clue.
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How Horses Took Over North America (Twice)
Horses vanished from North America for 10,000 years until a mammal brought them back.
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How a Supervolcano Made the Cenozoic’s Coolest Fossils
Yellowstone contains some of North America's most amazing fossil deposits.
