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      The evolution of dinosaurs.

      1
      Science (New York, N.Y.)
      American Association for the Advancement of Science (AAAS)

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          Abstract

          The ascendancy of dinosaurs on land near the close of the Triassic now appears to have been as accidental and opportunistic as their demise and replacement by therian mammals at the end of the Cretaceous. The dinosaurian radiation, launched by 1-meter-long bipeds, was slower in tempo and more restricted in adaptive scope than that of therian mammals. A notable exception was the evolution of birds from small-bodied predatory dinosaurs, which involved a dramatic decrease in body size. Recurring phylogenetic trends among dinosaurs include, to the contrary, increase in body size. There is no evidence for co-evolution between predators and prey or between herbivores and flowering plants. As the major land masses drifted apart, dinosaurian biogeography was molded more by regional extinction and intercontinental dispersal than by the breakup sequence of Pangaea.

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          Author and article information

          Journal
          Science
          Science (New York, N.Y.)
          American Association for the Advancement of Science (AAAS)
          0036-8075
          0036-8075
          Jun 25 1999
          : 284
          : 5423
          Affiliations
          [1 ] Department of Organismal Biology and Anatomy, University of Chicago, Chicago, IL 60637, USA.
          Article
          7627
          10.1126/science.284.5423.2137
          10381873
          e90268b1-7a17-4a53-98aa-417238dd53da
          History

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