One of the most widespread developments in the dinosaurs after the end of the Cretaceous period was the evolution of the arbrosaurs. These evolved from the small, primitive coelurosaur theropods. In Jurassic times the coelurosaurs gave rise to the birds, and the development of the arbrosaurs from the same stock was brought about by similar evolutionary processes. Perhaps the most typical of the modern arbrosaurs is the genus Arbrosaurus itself. Various species of this animal appear in almost all the zoogeographical realms.
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