INFRAORDERCOELUROSAURIATraditionally, the carnivorous thero' pods are further subdivided (into infra' orders) according to their size. There were large, massively built predators called carnosaurs (see pp. 114-121). There were mediunvsized carnivores called deinonychosaurs, with a kill' ing claw on each hind foot (see pp. 110-113). And there were small, lightweight hunters called coelurosaurs (below). Their name means "hollow' tailed lizards," and refers to the thim walled, hollow bones that made up not only their tails, but most of their delicately built bodies.
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The Macmillan Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals
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