disapproval If you refer to an organization as a dinosaur, you mean that it is large, inefficient, and out of date. industrial dinosaurs. Any of the extinct reptiles that were the dominant land animals during most of the Mesozoic Era (248-65 million years ago). The various species appeared at different times, and not all overlapped. The shape of the teeth reveal whether a given dinosaur was a carnivore or herbivore. Dinosaurs are classified as either ornithischians or saurischians, based on pelvic girdle structure. Most had a long tail, which they held straight out, apparently to maintain balance. Most, if not all, were egg layers. Some were probably warm-blooded. Dinosaur fossils have been found on every continent, including Antarctica. Most types of dinosaurs flourished until late in the Cretaceous Period (65 million years ago), then disappeared within the next million years. Two theories for the cause of this mass extinction, following some 140 million years of existence, are that mountain-building cycles altered habitat and changed climate or that an asteroid hit the Earth, resulting in immense dust clouds that blocked sunlight for several years. Birds are thought to be living descendants of the dinosaurs. See also carnosaur; sauropod
Any reptile of the subclass Archosauria distinguished from other reptiles especially by features of the pelvic bones Dinosaurs were carnivorous or herbivorous, bipedal or quadrupedal, land-dwelling, and of moderate to very large size Range, Triassic to Cretaceous
Any reptile of the subclass Archosauria distinguished from other reptiles especially by features of the pelvic bones Dinosaurs were carnivorous and herbivorous They also did not fly or swim They died out at the end of the Cretaceous Period 65 million years ago
[ 'dI-n&-"sor ] (noun.) 1841. New Latin Dinosaurus, genus name, from Greek deinos terrifying + sauros lizard; more at DIRE.
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