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Gorgosaurus libratus was a carnivorous theropod dinosaur, living 76.5 to 75.1 million years ago and first unearthed from the Dinosaur Park Formation of Alberta in 1913 (1, 2, 3). It was a remarkable specimen for its time, having a nearly complete skeleton, including a skull and the first tyrannosaurid hand ever discovered (1). G. libratus, like the well-known Tyrannosaurus rex, is a member of the Tyrannosauridae family. However, G. libratus is a very early member of this family and is more closely related to Albertosaurus (4).

Though one of the largest predators in its environment, G. libratus was smaller than some of its tyrannosaurid relatives, with adults reaching 8 to 9 m in length and weighing approximately 2400 to 2600 kg (5, 6, 7, 8). G. libratus is known from abundant fossils, leading to a wide variety of research on subjects such as growth rate, mortality, and paleopathology (9, 10, 11). 

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© Katherine Dzikiewicz

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