A rare cache of fossil dinosaur embryos discovered in China reveals that these extinct behemoths grew faster in the egg than any animal known, an international research team reported in Nature on Wednesday.

The researchers believe the 195-million-year-old remains belong to a long-necked, plant-eating dinosaur called Lufengosaurus, which grew to as long as 30 feet. This dinosaur family, once common in China, eventually evolved into the largest creatures to ever walk the Earth.

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