Stegoceras was about 6½ feet (2 meters) long, and stood about 3½ feet (1.1 meters) tall. It weighed somewhere in the region of 100 to 150 pounds (45 to 70 kilograms).
Stegoceras (like its much larger cousin, Pachycephalosaurus) was equipped with bony dome on its skull,. In the case of Stegoceras, this dome which was about 3 inches (8 centimeters) thick.
As with Pachycephalosaurus, many scientists once thought that Stegoceras would have used the dome on its head may have been used inbutting contests for mates (in a way similar to the behavior modern big-horned sheep), or to defend against predators. In recent years, however doubt has been cast on this theory, in particular because it was not anatomically possible for the animal to align its head, neck, and body in a line, which would have been necessary to transmit force. An alternative theory that has been suggested, is that perhaps Stegoceras engaged in flank-butting contests - however, further research in this area is needed.
One interesting aside is that when Stegoceras was first discovered, only a few fragmentary fossils were found, and from these, for a number of years, it was thought that Stegoceras was the same animal as Troodon. However, after further fossils were discovered, it was clear that Stegoceras was in fact a different animal entirely.
Stegoceras was a herbivore (plant-eater) that lived from 83 to 65 million years ago
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