-Dinosaur's Origin= The earliest dinosaurs originated and diverged in what is now South America before trekking across the globe more than 220 million years ago when the continents were assembled into one gargantuan landmass called Pangea.
-Dinosaur's Evolution= Dinosaurs arose from small dinosauromorph ancestors in the Triassic period, when the climate was harsh and dry. They faced "competition from the croc-line archosaurs for tens of millions of years, [but] finally prevailed when Pangaea began to split," Brusatte told Live Science.The 'Age of Dinosaurs' (the Mesozoic Era) included three consecutive geologic time periods (the Triassic, Jurassic, and Cretaceous Periods). Different dinosaur species lived during each of these three periods -Dinosaurs Habitat= Most of the dinosaurs we have found lived along ancient rivers or streams and roamed across the adjacent forested floodplains and densely vegetated swamps and lakes. Some discoveries have also shown that dinosaurs inhabited ancient deserts strewn with fields of sand dunes.
-Dinosaur Size= Drawing from a data set of 584 dinosaurs, Campione notes, most non-avian dinosaurs had a mass of about 7,700 pounds. That's a pretty big animal, somewhere between modern-day rhinos and elephants.
-Dinosaur Period of Existense= Non-bird dinosaurs lived between about 245 and 66 million years ago, in a time known as the Mesozoic Era. This was many millions of years before the first modern humans, Homo sapiens, appeared.