Did you know?! ⬇️😳 Dinosaurs roamed the Earth during the Mesozoic Era, which spanned from approximately 252 to 66 million years ago. This era is further divided into the Triassic, Jurassic, and Cretaceous periods. Dinosaurs first appeared in the Triassic period, and their dominance continued throughout the Jurassic and Cretaceous periods until many became extinct at the end of the Cretaceous period. The ones that outlived all others were down deep in the dark and unknown waters, leaving behind