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For various other uses, see Dinosaur (disambiguation).


Temporal range: Central Triassic–Present, 231. 4–0 Mum (range involves birds) PreЄ












A collection of fossil prehistoric skeletons. Clockwise from leading left: Microraptor gui (a winged theropod), Apatosaurus louisae (a giant sauropod), Stegosaurus stenops (a plated stegosaur), Triceratops horridus (a horned ceratopsian), Edmontosaurus regalis (a duck-billed ornithopod), Gastonia burgei (an armored ankylosaur). Technological classification elizabeth

Kingdom: Animalia

Phylum: Chordata

Clade: Dinosauriformes

Clade: Dinosauria

Owen, 1842

Major groupings









Dinosaurs certainly are a diverse group of animals from the clade Dinosauria. They first appeared during the Triassic period, roughly 230 million years ago, and were the dominant terrestrial vertebrates pertaining to 135 mil years, from the beginning of the Jurassic (about 200 million years ago) until the end with the Cretaceous (66 million years ago), if the Cretaceous–Paleogene annihilation event generated the termination of most ice age groups with the close from the Mesozoic Age. The fossil record shows that wild birds evolved from theropod dinosaurs throughout the Jurassic Period and, therefore, they are regarded a subgroup of dinosaurs in most modern day classification devices.[1][2] Several birds made it through the annihilation event that occurred sixty six million yrs ago, and their rejeton continue the dinosaur family tree to the present day.[3]

Dinosaurs are a varied group of animals by taxonomic, morphological and environmental standpoints. Birds, at over 9, 1000 living types, are the many diverse selection of vertebrates besides perciform fish.[4] Using fossil evidence, paleontologists have determined over five-hundred distinct genera[5] and more than 1, 500 different types of non-avian dinosaurs.[6] Dinosaurs are represented on every continent by simply both extant species and fossil is still.[7] Some are vegetarian, others predacious. Most dinosaurs have been bipedal,[not verified in body] though many vanished groups included quadrupedal types, and some could actually shift among these physique postures. Many species have got elaborate display structures such as horns or crests, and some prehistoric organizations developed skeletal modifications just like bony armor and spines. Birds have been the planet's dominant soaring vertebrate because the extinction with the pterosaurs, and evidence shows that egg lounging and nest building is known as a trait distributed by every dinosaurs. Various prehistoric dinosaurs were significant animals—the major sauropods may have obtained a length of 58 yards (190 feet) and a height of 9. 25 meters (30 feet 4 inches)[8]—but the idea that non-avian dinosaurs were consistently gigantic is known as a misconception based on preservation bias; large, strong bones are more likely to last right up until they are fossilized. Many dinosaurs were quite small; Xixianykus, for example , was only about 40 cm (20 in) long.

Although the word dinosaur means " terrible lizard", the name can be somewhat deceptive, as dinosaurs are not lizards. Rather, they represent a separate group of reptiles with a distinct upright good posture not found in lizards, and a lot of extinct forms did not display traditional reptilian characteristics. In addition , many prehistoric animals, which includes mosasaurs, ichthyosaurs, pterosaurs, plesiosaurs, and Dimetrodon, are popularly conceived of as dinosaurs, but are certainly not classified because dinosaurs. Throughout the first half of the 20th 100 years, before chickens were proven to be dinosaurs, most of the scientific community assumed dinosaurs to be sluggish and cold-blooded. Most research...


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