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Liopleurodon is an extinct genus of carnivorous pliosaurs that lived from the Callovian stage of the Middle Jurassic to the Kimmeridgian stage of the Late Jurassic period. Liopleurodon is a representative of the Thalassophonea clade, a derived group of pliosaurids characterized by a short neck and a large elongated skull. In 1999, the size of Liopleurodon was greatly exaggerated in the BBC documentary series Walking with Dinosaurs, depicted as reaching 25 m (82 ft) in length. However, the different attributed specimens show that the animal could reach a size ranging from 4 to 8 m long, with some researchers estimating a maximum length of approximately 10 m (33 ft). Various studies suggest that Liopleurodon would have been a ambush predator, feeding on fish, cephalopods and other marine reptiles.