Illustration courtesy Julius Csotonyi
A Massospondylus parent cares for its young in an artist's rendering.
The newfound dinosaur-egg clutches provide the oldest evidence yet for several aspects of dinosaur behavior, according to the study.
For example, paleontologists found multiple nests in a single layer of rock, suggesting that mothers gathered in groups to lay their eggs. This is the oldest example of "colonial nesting" in the fossil record, the scientists say.
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