SuperCroc is the largest crocodilian ever discovered. Its skull alone was six feet long. Based on skull and bone measurements and comparisons with modern crocs, it grew to between 37 and 40 feet and weighed up to pounds.
Skull of Barbourofelis, extinct carnivorous mammals which lived during the Miocene to 6 mio years ago) in North America. For a parallel evolution phenomenon, the appearance of this predator reminded very much the saber-toothed tigers.