University of Pennsylvania/ CBS News

Published: Aug 29, 2014 12:45 PM EDT

Pa.- Did dinosaurs leave their kids with babysitters? At least one plant-eating species might have.

University of Pennsylvania researchers worked with a group in China to analyze an intact 120-million-year-old fossilized dinosaur nest.

In the nest, the skeletons of 24 baby dinosaurs were found closely entwined with one adolescent of the same species of plant-eating Psittacosaurus.

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