Dinosaurs are superlative animals in every sense of the word. Researchers compared the vertebrae of a duck-billed dinosaur with the skeletons of two humans who were known to have a rare and sometimes painful disease that affects children, mainly boys.
What about the largest land animal? The largest crocodile that ever walked the earth, Sarcosuchus, aka the SuperCroc, measured about 40 feet from head to tail and weighed in the neighborhood of 15 tons (making it slightly more menacing than the already pretty menacing Deinosuchus, pictured in slide #4). The collection included a femur (thighbone) that measured 2.4 meters (8 feet) from end to end. Some herbivorous species also walked on two feet. The rocks within which the fossils were found dated to 100 million to 70 million years ago. The largest known terrestrial mammalian carnivoran of all time was (possibly) the South American short-faced bear (Arctotherium) source 1 source 2.
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