Crocodiles and birds, the closest living relatives of extinct dinosaurs, build nests and lay eggs. So it's not surprising that fossils provide evidence that non-avian dinosaurs did so, too. But direct fossil evidence for nests and eggs is unusual because these objects are fragile and easily eroded or destroyed.
The Central Asiatic Expeditions, led by AMNH's Roy Chapman Andrews and Walter Granger, discovered some of the earliest, well-preserved dinosaur eggs in Mongolia during the 1920s. The ova
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