El hábitat del Pachycephalosaurus era principalmente en América del Norte

approximately 15 to 10 million years ago

huge prehistoric giant tortoises

This particular species belonged to a subgroup of therapsids known as dicynodonts

Troodons were small

Ophthalmosaurus Scale:1:72 El hábitat del Pachycephalosaurus eraThe scene begins with two Ophthalmosaurus icenicus, aquatic ichthyosaur species that lived during the Middle Jurassic to early Late Jurassic, swimming gracefully in the crystal clear waters of an underwater reef. Their streamlined bodies, covered in scales, gracefully glide through the water, leaving a trail of ephemeral bubbles in their wake. Named for their large eyes, these impressive marine reptiles move in perfect synchrony, flicking their fins