How big was the giant pliosaur, Kronosaurus? At 12.8 metres long, this Kronosaurus fills the entire room at the Museum of Comparative Zoology, Harvard University. However, there's always a however. About a third of the fossil was reconstructed with plaster (known to many as Plasterosaurus IYKYK) and included too many vertebrae. Despite being downsized to about 10 metres long, it was still a fearsome beast that would have patrolled the ancient Cretaceous seaways! In the early 1930s, a team from t