dinosaur coloring pages
Dinosaurs were the dominant vertebrate animals of terrestrial ecosystems for over 160 million years, from the late Triassic period (about 230 million years ago) until the end of the Cretaceous period (65 million years ago), when most of them became extinct in the Cretaceousâ€“Tertiary extinction event. The 10,000 living species of birds have been classified as dinosaurs.
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Bruce Blitz How to Draw a Cartoon Dinosaur from youtube
The term â€œdinosaurâ€ was coined in 1842 by Sir Richard Owen and derives from Greek Î´ÎµÎ¹Î½ÏŒÏ‚ (deinos) â€œterrible, powerful, wondrousâ€ + ÏƒÎ±á¿¦ÏÎ¿Ï‚ (sauros) â€œlizardâ€. It is sometimes used informally to describe other prehistoric reptiles, such as the pelycosaur Dimetrodon, the winged pterosaurs, and the aquatic ichthyosaurs, plesiosaurs and mosasaurs, although none of these animals were dinosaurs. Through the first half of the 20th century, most of the scientific community believed dinosaurs to have been slow, unintelligent cold-blooded animals. Most research conducted since the 1970s, however, has supported the view that dinosaurs were active animals with elevated metabolisms and numerous adaptations for social interaction. The resulting transformation in the scientific understanding of dinosaurs has gradually filtered into popular consciousness.
This list of dinosaurs is a comprehensive listing of all genera that have ever been included in the superorder Dinosauria, excluding class Aves (birds, both living and those known only from fossils) and purely vernacular terms. The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful (nomen dubium), or were not formally published (nomen nudum), as well as junior synonyms of more established names, and genera that are no longer considered dinosaurs. Many listed dinosaurs have since been reclassified as everything from birds to crocodilians to petrified wood. The list contains 1228 names, of which approximately 834 are considered either valid dinosaur genera or nomina dubia.
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