File:The dinosaur book - the ruling reptiles and their relatives (1951) (20406608461).jpg

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Title: The dinosaur book : the ruling reptiles and their relatives
Identifier: bookruli00colb (find matches)
Year: 1951 (1950s)
Authors: Colbert, Edwin H. (Edwin Harris), 1905-2001; Knight, Charles Robert, 1874-1953; American Museum of Natural History
Subjects: Dinosaurs; Reptiles, Fossil
Publisher: New York : Published for the American Museum of Natural History by McGraw-Hill
Contributing Library: American Museum of Natural History Library
Digitizing Sponsor: IMLS / LSTA / METRO

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About This Book: Catalog Entry
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primitive or ancestral, two-legged posture —a very marked trend in the dinosaurs. Only in the persistently carnivorous thero- pods was the purely two-footed pose of the thecodonts retained. In all of the other saurischians and ornithischians there was a definite drifting away from the ancestral carnivorous mode of life, and from the bi- pedal pose. The sauropods and most of the ornithischian dinosaurs became large plant- eaters. A big bulkv animal would be at an obvious disadvantage in attempting to carry himself about on two legs; consequently these dinosaurs came down on all fours. But it must be remembered that this was a secondary return to the primary four-footed pose, and this can be seen because the front Some Details of Dinosaurian Structure and Relationships SAURISCHIA ORNITHISCHIA 1
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sauropods /stegosaurs cerotopsions ^ anki ankylosaurs Primitive reptiles y The small theropod dinosaur Ornitholestes, represented in the act of catching the first known bird, Archaeopteryx. Its food probably consisted mostly, however, of other small reptiles, eggs, insects, and the like. Ornitholestes preserved many of the features of the ancestral dinosaurs. From animals similar to this the great carnivores and sauro- pods evolved Restoration by Charles R. Knight \

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