History

Nobody really knows when dinosaurs started but we can estimate around 230 million years ago. At first it was the Triassic period, then Jurassic then the most popular, Cretaceous period. The Cretaceous period held many famous things,  like T-Rex, Giganotosaurus, Spinosaurus, Velociraptor, and, of course, the end of all: The Asteroid. 

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The Cretaceous period was one of the most deadly. You have your power houses: Tyrannosaurus Rex, and the smartest  dinosaur ever: the Velociraptor. If not for the asteroid, the Velociraptor would likely have become the dominant species. The Cretaceous period was also very hard to live in because of the Mosasaurus. Not safe on land, not in water and not safe in the air due to the infamous Pteradactle.