Baby dinosaurs took three to six months to hatch

Fossils show dinos had incubation times more similar to reptiles than birds

Protoceratops andrewsi

SLOW GROW  This 75-million-year-old hatchling fossil of the dinosaur Protoceratops andrewsi was found in Mongolia. Fossilized P. andrewsi embryos reveal dinos had reptilelike incubation times.

© Mick Ellison/AMNH

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