Although it may seem incredible, while humans have only inhabited the Earth for 3-4 million years, before we did, dinosaurs walked this ground for 150 million years.So how could we forget about them?Discover the first dinosaurs that lived during the Triassic period, such as the Herrerasaurus or the Eoraptor, the immense long-necked herbivores of the Jurassic period, like the Diplodocus, and the great predators of the Cretaceous, like the Tyrannosaurus rex.