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Dinosaur From Wikipedia, the free encyclopedia Jump to navigationJump to search For other uses, see Dinosaur disambiguation. Dinosaurs Temporal range: Late Https://amazonia.fiocruz.br/scdp/blog/work-experience-programme/the-debate-regarding-the-formation-of-public.php, They first appeared during the Triassic period, between and They became the dominant terrestrial vertebrates after the Triassic—Jurassic extinction event The fossil record demonstrates that birds are modern feathered dinosaurs, having evolved from earlier theropods during the Late Jurassic epoch.

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As such, birds were the only dinosaur lineage to survive the Cretaceous—Paleogene extinction event approximately 66 million years ago. Dinosaurs can therefore be divided into avian dinosaurs, or birds; and non-avian dinosaurs, which are all dinosaurs other than birds. Dinosaurs are a varied group of animals from taxonomic, morphological and ecological standpoints. Birds, at over 10, living species, are the most diverse group of vertebrates besides perciform fish.

Using fossil evidence, paleontologists have identified over distinct genera and more than 1, different species of non-avian dinosaurs. Dinosaurs are represented on every continent by both extant species birds and fossil remains.

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Through the first half of the 20th century, before birds were recognized to be dinosaurs, most of the scientific community believed dinosaurs to have been sluggish and cold-blooded. Most research conducted since the s, however, has click that all dinosaurs were active animals with elevated metabolisms and numerous adaptations for social interaction. Some were herbivorous, Ot carnivorous. Evidence suggests that all dinosaurs were egg-laying; and that nest-building was a trait shared by many dinosaurs, both avian and non-avian.]