The movable jaw of the Mosasaurus from SchleichDINOSAURS contains many pointy teeth. When hunting prey such as fish or turtles, the dinosaur opened its mouth very wide and bit down powerfully. The shape of its teeth means that it probably didnt chew, and simply swallowed. As an adaptation to the habitat, its front and hind legs transformed into fins. It also had a fin on the end of its tail.