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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 17,500 pounds. Growth lines in cross sections of the two rows of 35 armored plates along its-neck, back and tail put its minimum life span at 50 to 60 years.
Nesodon, Trigodon and Toxodon, all mammals of the Miocene, late Pliocene and Pleistocene epochs from about 2.6 million to 16,500 years ago.   Nesodon was of the late Oligocene to Miocene epochs.
The 40-foot-long Sarcosuchus weighed about 8 tons - about twice as long, and ten times as heavy, as the biggest crocodiles alive right now.
Recreation of Gorgonops. This therapsid lived 250 million year ago, in the late Permian. Long before the dinosaurs and mammals, this beast roamed the earth.
Mosasaurs skull. Imagine it alive in the water,...  go have a swim.
Woolly Rhinoceroses (Coelodonta antiquitatis) first made their debut roughly 350,000 years ago during the Pleistocene epoch, which spanned from 2.59 million to 11,700 years ago. The Woolly Rhinos ate mostly low growing herbaceous vegetation, and were spread throughout in the mammoth steppe, a vast dry and cold region stretching all the way from Spain in the west to eastern Siberia in the east, and from subarctic latitudes in the north to the Mediterranean, southern Siberia
Skull of Barbourofelis, extinct carnivorous mammals which lived during the Miocene (15 to 6 mio years ago) in North America. The appearance of this predator reminded very much the saber-toothed tigers. The structure of the barbourofelis was very strong: it might look like a lion with the physique of a bear or a bear with the head of a lion.