Commonly confused as being a dinosaur, the Liopleurodon were part of a marine-reptile family called ‘Plesiosaurs’. Living at the height of the famous Jurassic era, the Liopleurodon remains the biggest hunter of its day. Weighing 3,500 pounds and with a length of thirty feet (a quarter of which was made up of its massive skull), the Liopleurodon would use its sheer power to grip and shake its prey to pieces, making sure to leave little for the sea.