Install this Dinosaur NewTab Themes and enjoy HD wallpapers of dinosaurs everytime you open a new tab.
The extension is made by fans, for fans who like dinosaurs, T Rex, dragons or animals in general… Visit our homepage for more HD wallpapers and newtab themes: http://freeaddon.com/
– Choose a wallpaper from many available dinosaurs wallpapers.
– Digital clock for Date-Time, Weather indicator (you may change city location manually), and Google search engine.
– Shuffle all dinosaurs images, or shuffle your favorite image only.
– Quick navigation with Most Visited, Chrome Apps, Gmail Unread Count. Manage tasks with To-Do list.
– Show/hide features, customize your own dinosaur theme.
– Combine background pictures from multiple FreeAddon new tab extensions.
– Dinosaurs are a diverse group of reptiles[note 1] of the clade Dinosauria. They first appeared during the Triassic period, between 243 and 231 million years ago, although the exact origin and timing of the evolution of dinosaurs is the subject of active research. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201 million years ago; their dominance continued through the Jurassic and Cretaceous periods. Reverse genetic engineering and the fossil record both demonstrate that birds are modern feathered dinosaurs, having evolved from earlier theropods during the late Jurassic Period. As such, birds were the only dinosaur lineage to survive the Cretaceous–Paleogene extinction event 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. This article deals primarily with non-avian dinosaurs.
– Dinosaurs are a varied group of animals from taxonomic, morphological and ecological standpoints. Birds, at over 10,000 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 (birds) and fossil remains. 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 1970s, however, has indicated that all dinosaurs were active animals with elevated metabolisms and numerous adaptations for social interaction. Some were herbivorous, others carnivorous. Evidence suggests that egg-laying and nest-building are additional traits shared by all dinosaurs, avian and non-avian alike.
– While dinosaurs were ancestrally bipedal, many extinct groups included quadrupedal species, and some were able to shift between these stances. Elaborate display structures such as horns or crests are common to all dinosaur groups, and some extinct groups developed skeletal modifications such as bony armor and spines. While the dinosaurs’ modern-day surviving avian lineage (birds) are generally small due to the constraints of flight, many prehistoric dinosaurs (non-avian and avian) were large-bodied—the largest sauropod dinosaurs are estimated to have reached lengths of 39.7 meters (130 feet) and heights of 18 meters (59 feet) and were the largest land animals of all time. Still, the idea that non-avian dinosaurs were uniformly gigantic is a misconception based in part on preservation bias, as large, sturdy bones are more likely to last until they are fossilized. Many dinosaurs were quite small: Xixianykus, for example, was only about 50 cm (20 in) long.
– Since the first dinosaur fossils were recognized in the early 19th century, mounted fossil dinosaur skeletons have been major attractions at museums around the world, and dinosaurs have become an enduring part of world culture. The large sizes of some dinosaur groups, as well as their seemingly monstrous and fantastic nature, have ensured dinosaurs’ regular appearance in best-selling books and films, such as Jurassic Park. Persistent public enthusiasm for the animals has resulted in significant funding for dinosaur science, and new discoveries are regularly covered by the media.
DINOSAURS FUN FACTS:
– Dinosaurs were reptiles that lived on Earth from about 230 million years ago to about 65 million years ago.
– Dinosaurs lived during a period of Earth’s history called the Mesozoic (“middle life”) Era. They lived during all three periods of this era: the Triassic, Jurassic, and Cretaceous.
– Meat-eating dinosaurs are known as theropods, which means “beast-footed,” because they had sharp, hooked claws on their toes. In contrast, plant-eating dinosaurs tended to have blunt hooves or toenails.
– Dinosaur skulls had large holes or “windows” that made their skulls lighter. Some of the largest skulls were as long as a car.
– Scientists estimate that there were over 1,000 different species of non-avian dinosaurs and over 500 distinct genera. They speculate there are many still undiscovered dinosaurs and that there may be as many as 1,850 genera.
– Dinosaurs lived on all the continents, including Antarctica.
– Colorado’s nickname is the Stegosaurus State. The first ever Stegosaurus skeleton was found near Morrison, Colorado.
– Random Dinosaur Facts
– The biggest plant eaters weighed over 100 tons
– Some of the biggest plant eaters had to eat as much as a ton of food a day. This is similar to eating a bus-sized pile of vegetation every day.
– Though mosasaurs, ichthyosaurs, pterosaurs, plesiosaurs, and Dimetrodon are commonly believed to be dinosaurs, they are not technically dinosaurs. The term “dinosaur” refers to just land-dwelling reptiles that have a specific hip structure, among other traits.
– While many people think dinosaurs were massive, dinosaurs were usually human sized or smaller. Scientists believe that the larger bones were just easier to be fossilized.