The Dinosauria Dinosaurs, one of the most successful groups of animals (in terms of longevity) that have ever lived, evolved into many diverse sizes and shapes, with many equally diverse modes of living. The term "Dinosauria" was invented by Sir Richard Owen in 1842 to describe these "fearfully great reptiles," specifically Megalosaurus, Iguanodon, and Hylaeosaurus, the only three dinosaurs known at the time. The creatures that we normally think of as dinosaurs lived during the Mesozoic Era, from late in the Triassic period (about 225 million years ago) until the end of the Cretaceous (about 65 million years ago). Some things to keep in mind about dinosaurs: • Not everything big and dead is a dinosaur. • Not all dinosaurs lived at the same time. • Dinosaurs are not extinct. Find answers to some commonly asked questions about dinosaurs: • Are birds really dinosaurs? Visit these special exhibits on some popular dinosaurs: Sources and suggested further reading: Weishampel, D.B., P.
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Probert Encyclopaedia - Dictionary, Online Encyclopedia, Online The Democratic Party American Footprints Perseus Digital Library Wikisource Wikipedia censors Bilderberg's Nazi roots -