Ceratopsians

Ceratopsians and ornithomimids were also very common, together making up another third of the known fauna.

Grinding hadrosaurids and shearing ceratopsians became extremely diverse across North America and Asia.

If the ceratopsians that lived alongside Tyrannosaurus were fast, that casts doubt on the argument that Tyrannosaurus did not have to be fast to catch its prey.

The exact location of Triceratops among the ceratopsians has been debated over the years.

This, and other apparent healed wounds in the skulls of ceratopsians, has been cited as evidence of non-fatal intraspecific competition in these dinosaurs. citation Martin, A.J. (2006).