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Dinosaurs have been a part of our lives since we were children. ... Dinosaurs were originally thought to be gigantic reptiles. The word Dinosaurs nowadays is used to name a group of extinct animals. Dinosaurs are classed as reptiles because of their reptilian skulls. Dinosaurs are two different kinds of animals. Dinosaurs are Saurischia and Ornithischia. ... Dinosaurs in both of these groups were probably scaly, egg-laying animals that walked in an erect posture like mammals. Dinosaurs did not crawl along close to the ground like todays reptiles. Scientists believe that the Dinosaurs were warm blooded like todays mammals and birds, thus making the Dinosaurs capable of making rapid movements. ... Scientists of today believe the Dinosaurs should be removed from the reptilian class and placed into a separate class of their own called Dinosauria or Archosauria.
The Sourischians or "lizard hipped" Dinosaurs were divided into three different groups: The first group was the Theropods. ...
The Ornithischians or "bird hipped" Dinosaurs were divided into four different groups: The first group of the Ornithischians is the Ornithopods. The Ornithopods were the dinosaurs that walked on two legs most of the time. ... The stegosaurs are the plated Dinosaurs. ... The Anklyosaurs are the armored dinosaurs. ... The Ceratopsians are the horned dinosaurs. ... Some scientists put the Dome-headed Dinosaurs or Pachycephalosaurs in a group of their own, but some scientists believe that the Pachycephalosaursis classified to be a sub-division of the Ornithopods.
The period in which Dinosaurs lived was known as the Mesozoic Era. ... The Mesozoic Era was divided into three periods: The first period of Dinosaurs is the earliest that we know of. ... Dinosaurs started to evolve around the middle of the Triassic Period and became extinct around the close of the Cretaceous Period. Around 140 million years that Dinosaurs existed there were many different kinds and varieties of Dinosaurs. We know all this about the Dinosaurs because we have found their fossilized remains and tracks. We are finding new Dinosaur discoveries every year and new facts on Dinosaurs are unearthed almost every day.
Only three dinosaurs from the Early Jurassic Era have been found in North America. Paleontologists have found at least seventeen different kinds of dinosaurs in Jurassic Rock. Among these seventeen different kinds of Dinosaurs are the enormous four-legged plant-eaters known as Sourpods. ... During this period it was not all gigantic Dinosaurs there were also small Coelurosaurs that still scurried about in the underbrush.
Approximate Word count = 1998
Approximate Pages = 8
(250 words per page double spaced)
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