Answer:
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 like modern carnivorous mammals- If it moves it might be something to eat! The Trachodont or duckbill ( many fine fossils survive) is believed to have been herbivorous ( plant-eating) in habit.) The Pterodactyls, which are NOT strictly speaking dinosaurs- were carnivorous and some went after fish- as do some modern day Bats.