 Both showed potential for evolving into sentient races, but only one could possibly arise on this world, due to the dinosaurs' ecological stranglehold on the planet.The Watcher sent his Jijaki, in spacecraft made from the blue material, to gather life forms from earth (sans mammals) to populate another world set aside for them.Introducing these dinosaurs to a moon orbiting a gas giant, The Watcher flung a meteorite at The Crucible, wiping out the remaining dinosaurs so that the mammals could inherit the earth.