19. Dinosaurs Roamed The Earth For More Than 165million Years
The first dinosaurs are believed to have sprung up on Earth roughly 230million years ago - and they lasted until about 65million years ago. Considering human beings are believed to have first appeared just 2million years ago, the dinosaurs had a good innings. Perhaps most impressively, they lived through the entire Mesozoic ("middle life") period - which consisted of the Triassic, Jurassic and Cretaceous spells.