Baby dinosaurs took three to six months to hatch
Fossils show dinos had incubation times more similar to reptiles than birds
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