Baby dinosaurs took three to six months to hatch
Fossils show dinos had incubation times more similar to reptiles than birds
![Protoceratops andrewsi](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2017/01/020417_notebook_rethink_main.jpg?fit=860%2C460&ssl=1)
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