Carnotaurus was a bipedal carnivore with miniscule forearms, a boxy head and bull-like horns. A pretty ugly dinosaur, if ever we saw one.
Carnotaurus lived in a lake or lagoon-dominated environment. The climate was warm but with distinct wet and dry seasons.
Carnotaurus' teeth were 7.5 times smaller than those of Tyrannosaurus rex.
Carnotaurus would have had a fairly standard sense of smell for a theropod dinosaur.
Only one Carnotaurus fossil has been found so far, which was by palaeontologist Jose Bonaparte in Argentina in 1985. Amazingly, most of the skeleton, its skull and skin impressions were unearthed. A discovery this detailed is extremely rare in palaeontology.
Height: 4m (13.12ft)
Length: 9m (29.52ft)
Weight: 2 tonnes (2.24 short tons)
Top speed: 40kph (24.85mph)
Vision: Carnotaurus had rather small eyes. We think its vision may not have been as important as its sense of smell.
Skin: From a fossilised skin sample, scientists have found that Carnotaurus had small pebbly scales over its body with large, conical scutes (bony plates) forming rows along its side.
Head: Carnotaurus had bull-like horns on its head. Males might have used these to fight other males over territory and females.
Prey: Carnotaurus would have been an active predator of small, agile prey.
Bite: Carnotaurus had a less powerful bite than T. rex, but its vaulted skull made it snappy like a turtle. Carnotaurus could have gripped victims securely in its backward-curving teeth.
Nest: Carnotaurus eggs are assumed to fit the usual theropod pattern: bird-like in shape, measuring between 10 and 15 cm (4-6in) long and with a shell a couple of millimetres (0.07in) thick.