There have been some fossils suggest the existence of intelligent life, dating as far back as the dinosaurs age and if the earth can have intelligent life today, it isn't crazy similar might have happened before, either amount insects or reptiles. Some ancient cave painting was found showing animals that look like men, domesticating triceratops and riding paraeducators. What seems to be an animal design nuclear reactor was found burying miles below the earth in Africa, dated back to a time, even before the dinosaurs.
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Actually, there is a scientific theory believing, there are intelligent dinosaurs amount smaller meat-eating species and there are cave painting of raptor looking human domesticating paraeducators and triceratops, been found.