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About 70 million years ago, a wee ostrich-like dinosaur wriggled inside its egg, putting itself into the best position to hatch. But that moment never came; the embryo, dubbed "Baby Yingliang," died and remained in its egg for tens of millions of years, until researchers found its fossilized remains in China.
Researchers have discovered many ancient dinosaur eggs and nests over the past century, but Baby Yingliang is one of a kind.
https://www.livescience.com/dinosaur-embryo-fossil-egg-discovered