アメリカ自然史博物館のインスタグラム(amnh) - 4月9日 00時51分

Look! It’s a fledgling ‪#FossilFriday. This extraordinary fossil, discovered in Mongolia, preserves a recently hatched Byronosaurus atop the eggs of what would have been its nest mates. Byronosaurus was a tiny animal belonging to the troodontids, a group of small, feathered, non-bird dinosaurs with large brains. It lived in the Late Cretaceous, about 80 million years ago.
Learn more about dinosaur nests, eggs, and babies in the new exhibition, Dinosaurs Among Us, now open!
Images: © AMNH/M. Ellison

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