With their long, hydrodynamic bodies; supple, muscular tails ending in an efficient bi-lobed tail fluke; and limbs transformed into flippers for balance and steering, the large mosasaurs exhibited in this room were certainly fast swimmers, and with their powerful jaws, also dangerous predators! They could certainly hold their own against the large sharks that cruised the same seas during the Upper Cretaceous period! The largest mosasaurs could eat sharks when the opportunity arose.