Mosasaurus Tooth
Mosasaurus, now extinct, were carnivorous, aquatic lizards, somewhat resembling crocodiles with hydrofoil-like flippers, and they had elongated heavy jaws. The genus existed during the Cretaceous period, around 70 million years ago. Experts believe that Mosasaurus lived near the ocean surface, where it preyed on fish, turtles, ammonites, and possibly small mosasaurs. Although it was able to dive, it evidently did not venture into deeper waters.