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This exceptionally preserved Protoceratops specimen includes six embryos that preserve nearly complete skeletons. M. Ellison/©AMNH Previously discovered dinosaur eggs were all hard-shelled. But fossilized eggs from two dino species in the Gobi Desert had soft shells, a June study revealed. I ve been excavating in Mongolia for 20 years now, and we find a lot of dinosaur eggs. But these clutches tell us something very different from what we knew before, Mark Norell, the lead author of the study and a paleontologist at the American Museum of Natural History, previously told Business Insider. Of the more than a dozen eggs Norell s team found, some came from Protoceratops, a 75-million-year-old, sheep-sized herbivore. The rest belonged to Mussaurus, a 20-foot, long-necked herbivore that lived at least 200 million years ago. The finding suggests hard-shelled eggs an advantageous evolutionary milestone that allowed the animals to flourish cropped up much later in the dinosaur fos

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