Carnotaurus's skull measured just under 60 cm (2 ft) in length.Carnotaurus was a large theropod that lived in South America during the Late Cretaceous Period. It is known from a single fossil, an almost complete skeleton, that was found in Patagonia in 1984. The name Carnotaurus means “flesh-eating bull”, after its bull-like appearance: it had a short, bull-like head with its thick horns above its forward-facing eyes. Carnotaurus had a slender lower jaw with long, thin teeth. Its arms were extremely short, with four immobile, claw-less fingers. The skin on its body was lined with rows of bony lumps. It had a long, thin tail.
Closely related to Carnotaurus was Aucasaurus, another Late Cretaceous South American theropod. A smaller animal than Carnotaurus, it, too, had tiny arms with useless hands. A fossil found of its skull was damaged, leading palaeontologists to think it might have been smashed during a clash with another Aucasaurus.
Carnotaurus's fossil included, unusually, skin impressions. These showed that its skin was made up of disc-like scales. Unlike those of some lizards and snakes, the scales did not overlap.
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