You are in the forests of New Mexico, 90 million years ago.

The air was heavy and warm. You watch from behind a dense thicket of conifer trees as a small group of Zuniceratops feeds on ferns. One adult male, his skin a mottled dull brown, sports a pair of sharp, forward-curving brow horns. His large frill, thin in the center with two large openings, catches the dappled sunlight—a visual display likely used to mark his territory.

A younger bull, eager for dominance, lowers his head and snorts, challenging the older male. They lock horns with a resounding crack, a display of strength to determine breeding rights, their high-pitched calls echoing off the distant mesas.