A pair of Protoceratops.
The Protoceratops is the first ancestor of the famous ceratopsian family to resemble the later, more famous members such as Triceratops. It was much smaller than its more famous relatives, but had a very successful design that lasted for many millions of years. Protoceratops didn't have horns to protect itself with, just its sharp beak to bite with.
It is a fairly common fossil, being one of the few dinosaurs that's complete growth history can be seen in fossils ranging from an infant to an adult. Like other ceratopsians, each individual shows a difference in the size and shape of its frill. Protoceratops frills were not solid and did not grow overly large. Some scientists believe that the frills may have been brightly colored for display, either to intimidate attackers or for courtship. There are some fossils of this species that show a small horn on the snout. This is thought to be a gender differentiation. from the Jurassic Park wiki.
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