Find out more about the TERRIFYING pliosaur, thought to be the T-rex of the oceans 😱 ⁣ ⁣ This World Oceans Day, Sir David Attenborough reveals the secrets of the ultimate marine predator, the pliosaur.⁣ ⁣ #SirDavidAttenborough #DavidAttenborough #Nature #Dinosaurs #Throwback ⁣ ⁣ Attenborough and the Giant Sea Monster: Sir David Attenborough investigates the discovery of a lifetime: the giant skull of a prehistoric sea monster, known as a pliosaur – the Tyrannosaurus rex of the seas!