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By John Kricher, Recorded Books

A sequence of lectures on dinosaurs awarded by way of John Kricher, professor of biology at Wheaton university, protecting: the altering perspectives of dinosaur improvement; the evolutionary and ecological relationships between dinosaurs; what it may well were like within the Mesozoic period; and the query of what finally led to the whole extinction of all non-bird dinosaurs and the tip of the Cretaceous Period.

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Bakker’s articulate and persistent arguments in favor of dinosaur endothermy soon created intense debate, some of it heated and contentious. As with all of science, from controversy comes research and from research comes knowledge. Ostrom and Bakker had, in effect, created what has been described (by Bakker, though others firmly agree) as a “Dinosaur Renaissance,” where morphology as well as the behavior and ecology of dinosaurs has been seriously re-examined and, in general, significantly revised.

Many forms of pterosaurs evolved and some that lived late in the Mesozoic had wingspans of up to forty feet or more. All pterosaurs perished at the end of the Cretaceous. Perhaps the most abundant vertebrate animal of the early Triassic was LYSTROSAURUS, a dicynodont (“double dog-tooth”) mammal-like synapsid. These sheep-sized, stocky, four-legged grazers abounded in many places. Other synapsids were significant predators, such as a wolf-like group called the gorgonopsids. Gradually a group of synapsids called cynodonts (“dogtooth”) evolved to be increasingly mammalian until true mammals emerged about 228 million years ago, approximately when dinosaurs first appeared.

Name and describe the various groups of dinosaurs found within the Saurischia and Ornithiscia? Suggested Reading Barrett, Paul. National Geographic Dinosaurs. : National Geographic Society, 1999. , and Kevin Padian, eds. Encyclopedia of Dinosaurs. New York: Academic Press, 1997. Dixon, Dougal. The Complete Book of Dinosaurs. London: Hermes House, 2006. , and David B. Weishampel. The Evolution and Extinction of Dinosaurs. 2nd ed. Cambridge: Cambridge University Press, 2005. Norman, David. The Illustrated Encyclopedia of Dinosaurs.

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