スミソニアン博物館のインスタグラム(smithsonian) - 6月8日 01時29分

🔍Test your fossil detective skills this #FossilFriday. Can you guess what animal these belonged to? Clues:
🦴It lived in a rich ecosystem that flourished 67 to 66 million years ago, and was found in present-day Montana.
🦴Its thick, serrated teeth ripped through flesh—sometimes leaving holes in other dinosaurs’ bones.
🦴Most of the tail of the one in @smithsoniannmnh's #DeepTime was washed away before the skeleton was buried. We used casts from other specimens to replace the missing bones.

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