Star Chaser Lore: We thought the Dinosaurs went extinct, turns out they just left!

Dinosaurs! They went out for some milk.

So basically over the millions of years they existed the Saurian race developed into a high society, but also the early humans started evolving and causing trouble for the Saurians, viewing it wrong to wipe a blossoming species off the face of the Earth, The Saurians decided to have a mass Exodus

YES the monkee lore