Historians, archaeologists, and all the other historical research people researched towards the end of the dinosaur age.
What about dinosaurs, the gargantuan creatures we are all still confused with even today? Dinosaurs have no brains but what they lacked in brains they compensated with muscle and brawn.
The tyrannosaurus rex, mastodon, pterodactyl and the brontosaurus are all tradition in this field. Some believed that whatever their strengths, ultimately their unawareness or pride caused their defeat when a mammoth meteorite struck the earth millions of years ago to end their reign.