スミソニアン博物館のインスタグラム(smithsonian) - 3月15日 06時05分

Introducing a new (90 million-year-old) dinosaur, a discovery that reveals how T. rex became king, announced today by @smithsoniannmnh.
Until now, we didn't know much about how T. rex became a huge predator. This horse-sized #PreRex, officially named Timurlengia euotica, fills in a 20 million-year gap in the fossil record.
While it wasn’t large, it had a big brain and sharp hearing—showing that tyrannosaurs had to get smart before they got big. (Original Painting by Todd Marshall)

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