Weighing between 16,000 – 22,000 kg, it would take five elephants to balance the scales with this sauropod dinosaur on the other end. The name ‘Apatosaurus’, meaning ‘deceptive lizard’, was given by American palaeontologist Othniel C. Marsh who discovered its fossil remains. Marsh chose this name because some of its bones resembled those of some mosasaurs, a type of large aquatic reptile. Apparently, Marsh put the wrong head on the Apatosaurus when attempting to assemble his fossil findings. Well, either that, or he had travelled back in time about 156 million years ago and been lied to by the dinosaur. The first explanation is more likely.