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Carnotaurus was a uniquely bizarre predator that stalked the floodplains of Late Cretaceous Argentina between 69 and 66 million years ago. This is instantly recognizable by the two thick, bull-like horns projecting above its eyesâa feature that inspired its name, meaning "meat-eating bull." Its skull was unusually short and deep, with a blunt snout that gave it a distinctive face unlike the elongated heads of most theropods.
Perhaps the most striking feature of Carnotaurus was its remarkably reduced forelimbs. While T. rex is famous for its small arms, Carnotaurus took this to an extremeâits arms were proportionally even smaller and essentially , with four tiny fingers and virtually no elbow mobility. Scientists believe these arms served no functional purpose in hunting or feeding. In contrast, its powerful legs suggest it was built for pursuit, with some biomechanical studies indicating it could have been among the fastest large theropods.
The only known specimen was discovered in 1984 by JosĂ© Bonaparte's team in Patagonia's Chubut Province, Argentina. This remarkably complete skeleton, found in the La Colonia Formation, included extensive skin impressionsâa rare treasure that revealed Carnotaurus was covered in large, non-overlapping scales arranged in rows, with no evidence of feathers. This discovery has made Carnotaurus one of the best-understood large theropods from the Southern Hemisphere.
Carnotaurus belonged to the Abelisauridae, the dominant large predators of the southern supercontinent Gondwana during the Late Cretaceous. While tyrannosaurs ruled the north, abelisaurids like Carnotaurus filled the role in South America, Madagascar, and India. Its horns remain enigmaticâtoo small for effective combat, they may have been used in or species recognition.