Kronosaurus adapted almost perfectly for its marine ecosystem.  Like other plesiosaurs it had a streamlined torpedo shaped body that was propelled through the water by two sets of flippers, making them among the fastest swimming creatures that ever existed (Renneboog, 2011).  However Kronosaurus had a robust trait that stands out from many other Plesiosaurs.  However, unlike its relative Plesiosaurs, Kronosaurus had shorter necks with fewer cervical vertebrae and had a massive head.  The similarities of its skull and that of a crocodiles have been examined for years. Their short necks served as support structures for their oversized head and jaw, but its massive size made Kronosaurus less maneuverable.  Kronosaurus’ upper jaw consisted of twenty-five percent of its length (McHenry, 2009).  These massive jaws were armed with tirangular, dagger-shaped teeth (Renneboog, 2011).  Kronosaurus had an astounding bite force of 33,000 psi, which is more than six times as much as the modern day crocodile!  Here is an example of what one-sixth of Kronosaurus' bite force is capable of!  Its powerful jaws allowed it to crush the shells and consume even the largest turtles of its period (McHenry, 2009).  The head also flowed smoothly into the rest of the body allowing for minimum resistance and maximum speeds in the water (McHenry, 2009).  Its ability to swim at high speeds allowed it to hunt even the fastest prey and escape the larger predators.