Orodromeus was an Hypsilophodon from late Cretaceous North America. It was very fast and was 6.5 feet long. It is known form very good fossil remains and we know about its nesting. Mother Orodromeus laid a spiral of 12 eggs that where 6 inches tall and 2 inches wide. We also know that it had small embryos with a large head and small front arms. It probably also ate insects and fruits that lived in the Cretaceous period.