The spikes at the back of this dinosaur change as they grow, being more prominent in younger Stygimoloch and shorter in the adults.

Stygimoloch communicates primarily through snorts and grunts, like today's antelope.

Stygimoloch has a beak as well as teeth, allowing it to effectively nip bite-sized parts of the plants it eats.

Most of Stygimoloch's aggressive interactions are with each other.