THE TYPE AND ORIGIN OF DINOSAURS

The presence of dinosaurs described in film ‘Jurassic Park’ which created a storm in the world. The film created an interest in the minds of human beings regarding the earliest inhabitants of Earth. It created a new here for the children “The Dinosaur”. In this way, craze to discover these interesting creatures who are now extinct. Dinosaurs were the forerunners of animal life on Earth. The first dinosaur fossils were found in the early 19th century. The same was become a major attractions for people at museums around the world. Dinosaurs were primitively bipedal. Their probable ancestors were small bipedal Archosaurs. Dinosaurs also became part of popular culture.

          The great dinosaurs ruled on the earth nearly 150 million years ago. Dinosaurs were living on thisworld in a devastating way who altered the course of life on this earth. It has been predicted that it happened so sudden, as geologic time goes, that almost all the dinosaurs living on earth disappeared. So the question arise in our mind that how did these dominant creatures just die off? Was it a slow extinction, or did it happen suddenly? These questions created different beliefs on how the dinosaur appeared and disappeared quickly.

          Dinosaur literally means a terrible and dreadful lizard. The structure of Dinosaur also like a lizard except its size. Dinosaurs had hard, rough and scaly skins like lizards, however dinosaur is big in size andlizard is very small. They were cold-blooded reptiles. A major change in outlook came in the 1960s, when it was realized that small theropods were probably warm-blooded. In this way, the other question arise whether all theropods or even all dinosaurs were warm-blooded. The said question has not yet decided. They laid eggs like lizards and had long legs. They lived in swamps, on land, mountains, rivers, forests and everywhere on the Earth.

          There was hundreds of type of dinosaurs. Dinosaurs varied greatly in their size, shape, and features. They were different from each other in shape and size. Some of dinosaurs were imagine while some are very small. Their foods were also different from each other. They are divided into Ornithischians such as Protuberates and had hip bone like birds and Sacristans with hip bone like lizards like Diplodocus. Somewhere meat eaters and others ate plants. It means that some of Dinosaurs were carnivore and were consuming meat. Some of the Dinosaurs were omnivores and were consuming plants.

          They did not live at the same time and same era. Some lived 200 million years ago, others 70 million years ago. Not all dinosaurs were giants. Some such as compsognathus were of the size of a chicken and Heterodonatesaurus was of the size of a large dog. Brontosaurus and Diplodocus were really huge in size. About 65 million years ago, long before man came into existence, dinosaurs and the flying and swimming reptiles died suddenly. The only records left are their fossils. The reason for their abrupt disappearance is still a mystery. The people are trying to know about the whereabouts of dinosaurs but not yet got success.