The Carnotaurs are the primary antagonists in the movie Dinosaur.
The Carnotaurs aren't evil as they are carnivores, but they are known as antagonists because they hunt Aladar and all his friends in Disney's Dinosaur. They kill several dinosaurs in the herd including Bruton and Kron. Two Carnotaurs (a male and female, presumably) follow the herd along their journey to the nesting grounds. This, eventually, leads them into their doom.
A Carnotaurus first appears in the very beginning of the film where a young Parasaurolophus chases a flying lizard into the jungle. It then looks up to where the reptile is, but before it can get close saliva falls on the branch which caused the young dinosaur to look up where the Carnotaur eventually awakens. The young parasaurolophus starts running out of the jungle which causes attention to many of the herbivorous dinosaurs. As it starts running, the Carnotaur soon bursts out of the trees and starts chasing all the dinosaurs, and eventually kills a Pachyrhinosaurus.
At the middle of the film, two Carnotaurus, the more larger one presumbly the same one from the beginning of the movie, scare off a pack of Velociraptors. The pair go after the herd in which Aladar and his family and friends are in by following the tracks left behind. A little later, Bruton and a scout are attacked by the Carnotaurus. Bruton escapes to warn Kron, albeit being injured, as the scout is killed by them. As soon as Bruton tells Kron, he is left behind to fend for himself.
Later as Aladar, his family and friends, and Bruton take shelter from a rainstorm in a cave, the Carnotaurs attack. Bruton comes to the rescue and sacrificing himself by causing a cave-in. Bruton and one of the carnotaurs are both killed, but the other one survives and lives. As he exits the cave, he roars with anger because of the death of its companion and decides to seek revenge. It eventually finds Aladar with the herd and prepares to kill them all, Aladar first. But the herd fights back and makes the carnotaur back off to let them pass. But the battle isn't over. The male then spots Kron, the strict and brutal herd leader and follows him as he climbs a slide of rocks. When Kron gets to the top, he finds himself standing at a sheer drop with sharp rocks at the bottom. The Carnotaur has him blocked. Kron fights him, but loses. The bull male bites him on the back and throws him onto a rock mortally wounding him. Aladar, who also manages to get to the top, fights the Carnotaur and pushes it toward the edge of the cliff. Due to the Carnotaur's weight, the cliff ledge crumbles. In a final act the Carnotaur tries to pull Aladar down with him but fails and falls off the cliff to the rocks below . Aladar looks over the edge and sees the dead body of the Carnotaur.
In real life, the Carnotaurs lived during the Late Cretaceous Period, 70 million years ago, and hunted prey just like they do in the movie. But they may have been a little smaller than the Disney Carnotaurs. Their name means "carnivorous bull." It may have been called this because of not only its diet, but its small horn above each eye.