Dinosaurs wallpapers. Who were these jurassic creatures ? ...and why they still fascinate us ?
They first appeared during the Triassic period, approximately 230 million years ago, and became the dominant terrestrial vertebrates for 135 million years, from the beginning of the Jurassic (about 200 million years ago) until the end of the Cretaceous (65.5 million years ago), when the Cretaceous–Paleogene extinction event led to the extinction of most dinosaur groups at the close of the Mesozoic era. The fossil record indicates that birds evolved from theropod dinosaurs during the Jurassic, and consequently they are considered a type of dinosaur in modern classification systems. Some birds survived the extinction event that occurred 65 million years ago, and continue the dinosaur lineage to the present day.
Dinosaurs are a varied group of animals from taxonomic, morphological and ecological standpoints. Birds, at over 9,000 living species, are the most diverse group of vertebrates besides perciform fish. Using fossil evidence, paleontologists have identified over 500 distinct genera and more than 1,000 different species of non-avian dinosaurs. Dinosaurs are represented on every continent by both extant species and fossil remains. Some are herbivorous, others carnivorous. Most dinosaurs have been bipedal, though many extinct groups included quadrupedal species, and some were able to shift between these body postures. Many species possess elaborate display structures such as horns or crests, and some prehistoric groups developed skeletal modifications such as bony armor and spines. Birds have been the planet's dominant flying vertebrate since the extinction of the pterosaurs, and evidence suggests that egg laying and nest building is a trait shared by all dinosaurs. Many prehistoric dinosaurs were large animals--the largest sauropods could reach lengths of almost 60 meters (200 feet) and were several stories tall--and while many extinct theropods were quite large, a majority evolved very small sizes, especially among birds and other advanced groups.
Although the word dinosaur means "terrible lizard," the name is somewhat misleading, as dinosaurs are not lizards. Rather, they represent a separate group of reptiles with a distinct upright posture not found in lizards. Through the first half of the 20th century, before birds were recognized to be dinosaurs, most of the scientific community believed dinosaurs were sluggish and cold-blooded. Most research conducted since the 1970s, however, has indicated that ancient dinosaurs, particularly the carnivorous groups, were active animals with elevated metabolisms and numerous adaptations for social interaction.
Here are some of their main representative subspecies:Ankylosaurs, Hadrosaurs, Iguanodon, Apatosaurus, Stegosaurus, Velociraptor, Triceratops, Pterodactylus and of course the mighty Tyrannosaurus Rex.
Their diversity, the large sizes of some groups, and their seemingly monstrous and fantastic nature have captured the interest and imagination of the general public for over a century. They have been featured in best-selling books and films such as Jurassic Park, and new discoveries are regularly covered by the media.
Description: Dinosaurs wallpapers, brontosaurs, tyrannosaurus rex, stegosaurus wallpapers, at normal and widescreen resolution of 1280x1024px and 1920x1200px,
some dual screen wallpapers featuring jurassic reptiles like
Iguanodon, Apatosaurus, Velociraptor, Triceratops, Tyrannosaurus Rex.
All wallpapers may be used as backgrounds for your MySpace or Twitter profile.
Update historyDual screen wallpapers Last uploaded: jurassic teeth - under dinosaurs wallpapers, uploaded by Liana Recent uploaded:
king lizard in swamp - under dinosaurs wallpapers, uploaded by Liana
Normal and widescreen wallpapers Last uploaded: angry beast, uploaded by 3DataDesign Recent uploaded:
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last update: April 21 2012 09:26:45.
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