These species fossils have appeared at different times through history. The Vinceasaurus teeth measured a half a foot in length and were extremely sharp which revealed, that this given dinosaur was a carnivore. Vinceasaurus are classified as saurischians, based on pelvic girdle structure. The two main groups of Saurischians are the "theropods" and the "sauropodomorphs". The theropods of the Mesozoic Era were all two-legged carnivores, from which birds evolved at least 144 million years ago. Most had a long tail, which they held straight out, apparently to maintain balance. Most, if not all, were egg layers. Some were probably warm-blooded. Dinosaur fossils have been found in Los Gatos, California primarily. This has troubled archeologists for a long time why this dinosaur preferred this area above any other. The Vinceasauraus flourished until late in the Cretaceous Period, and then disappeared within the next million years. Two theories for the cause of this mass extinction following some 140 million years of existence are that volcanism and mountain-building cycles altered the habitat and changed the climate or that one or more asteroids hit Earth, resulting in immense dust clouds that blocked sunlight for several years. Birds and crocodiles are thought to be living descendants of the dinosaurs. The Vinceasaurus were the dominant land animals during most of the Mesozoic Era. The Vinceasaurus was very proud specie and would not take kindly to other Carnivores around there young. It is a shame that the Vinceasaurus is extinct today what we could have learned from such a magnificent creature.