Dinosaur: Evidences about their existence and Theories about

We are today trying to study scientific theories of dinosaurs, as distinct from colorful imagination of fiction writers supported by multiple evidence discovered by paleontologists.

We are thankful to these fiction writers and moviemakers for arousing worldwide interest of common man in this favorite study topic of the scientists. Many of us are now eager to know more about Dinosaurs.

"Dinosaur" reaches deep into our minds and drags out nightmares from monster myths. What is the truth about dinosaurs that underlies the awe that covers them? What does modern science have to say about the dinosaurs? Did Dinosaurs ever exist on earth? Were they truly obsolete, long-extinct relics of a more primitive and experimental stage in the history of life, or is there more to the Dinosaurian than meets the eye?

We are trying to study in this paper evidence of existence of Dinosaurs and if they existed, what did the

Stress on the dinosaurs is another possible reason for their demise. This theory was first thought up by Heinrch K. Erben when he found that the shell thickness of a certain type of dinosaur species decreased as time went on. A problem with this theory is that it is unknown if this happened to all of the dinosaurs or just the one species that Erben studied.

It is very difficult to figure out how the dinosaurs sounded, how they behaved, how they mated, what color they were, or even how to tell whether a fossil was male or female. There were lots of different kinds of dinosaurs that lived at different times. Some walked on two legs (bipedal), some walked on four (quadrupedal). Some could do both. Some were speedy, and some were slow and lumbering. Some were armor-plated, some had horns, crests, spikes, or frills. Some had thick, bumpy skin, and some even had primitive feathers. Large dinosaurs like the long-necked, lumbering sauropods would have had the most incentive to use color as a way of blending in, simply because they could not move very fast if they were unlucky enough to catch the eye of a predator. If you re big and slow, you don t want to be shocking pink that would be pretty much like saying, Dinner is served. Some dinosaurs ate lizards, turtles, eggs, or early mammals. Some hunted other dinosaurs or scavenged dead animals. Most, however, ate plants (but not grass, which hadn't evolved yet). Rocks that contain dinosaur bones also contain fossil pollen and spores that indicate hundreds to thousands of types of plants existed during the Mesozoic Era. Many of these plants had edible leaves, including evergreen conifers (pine trees, redwoods, and their relatives), ferns, mosses, horsetail rushes, cycads, ginkos, and in the latter part of the dinosaur age flowering (fruiting) plants. Although the exact time of origin for flowering plants is still uncertain, the last of the dinosaurs certainly had fruit available to eat. Dinosaurs probably communicated both vocally and visually. The chambered headcrests on some dinosaurs such as Corythosaurus and Parasaurolophus might have been used to amplify grunts or bellows. Defensive posturing, courtship behavior, and territory fights probably involved both vocal and visual displays. An angry Triceratops bull shaking his head at you, even silently, would have made himself very clearly understood! Animal lifespan relate in part to their body size and in part to their type of metabolism. Dinosaur lifespan probably varied in length from tens of years to hundreds of years. Their possible maximum age can be estimated from the maximum lifespan of modern reptiles, such as the 66-yea

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