Dinosaurs were not always mean and those that were were not intentionally mean. Dinosaurs went on instinct so they did not choose what they did. Carnivores("meat eaters") were usually the ones...
The bipedal ( walked about on two feet) Dinosaurs such as the Tyrannosaurus Rex and the Allosaurus were , as judged from fossils, aggressive, carnivorous, that is meat-eating and led a life style...
Dinosaur means "terrible lizard." When people began to study dinosaur bones they thought that they were an extinct species of giant lizards, and judging by the size of them they imagined they would...