On the left, the Mosasaurus was a definitive presence among the reptiles of the sea. As many as forty species are known to have existed, having reached lengths of 29 feet. Unlike Ichthyosaurs, Mosasaurs persisted until the end of Mesozoic period, shown here snapping up a Pternadon, who reached wingspans of 23 feet towards the late Cretaceous period.

To the right, the Cetiosaurus was a relatively short-necked dinosaur when compared with a brachiosaur, but it's unusually long front legs helped place it's head for high browsing eating habits. It's maximun height is19.5 feet and length is 52 feet long.