The Dinosaur Encyclopedia [Michael Benton] on *FREE* shipping on qualifying offers. Explore the fascinating prehistoric world of the dinosaur. Buy books about dinosaurs on line. Everything Dinosaur stocks a huge range of dinosaur books for kids including the encyclopedia of. Dinosaur Dinosaurs are a group of now-extinct, terrestrial reptiles in the order Dinosauria. They lived during the Mesozoic Era, from about million years ago.
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It appears that dinosaur encyclopedia major groups of dinosaurs evolved from the thecodonts, the ornithischian "bird hips" dinosaurs and dinosaur encyclopedia saurischian "lizard hips" dinosaurs. These two groups are distinguished largely on the basis of the anatomical structure of their pelvic or hip bones.
In general, dinosaurs can be classified as carnivorous meat-eating or herbivorous plant-eating. The carnosaurs were a group of saurischian predators that grew large and had enormous hind limbs but tiny dinosaur encyclopedia limbs.
Tyrannosaurus rex, perhaps the best known of all dinosaurs, was once considered the largest carnivore that ever stalked Earth's landscape. Its scientific name is derived from Greek words for "absolute ruler lizard. Tyrannosaurus rex had a massive dinosaur encyclopedia and a mouth full of about 60 dagger-shaped, sharp, serrated teeth.
Those teeth grew to a dinosaur encyclopedia of 6 inches 15 centimeters and were renewed throughout the life dinosaur encyclopedia the animal. This predator probably ran in a lumbering fashion on its powerful hind legs.
The hind legs also may have been used as dinosaur encyclopedia, kicking weapons. Scientists think that Tyrannosaurus rex may have initially attacked its prey with powerful head-butts and then torn the animal apart with its enormous jaws.
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Alternatively, Dinosaur encyclopedia rex may have been primarily a scavenger of dead dinosaurs. The relatively tiny fore legs of Tyrannosaurus rex probably only had minor uses.
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The long and heavy tail of the dinosaur was used as a counterbalance for the animal while it was running and as a stabilizing prop while it was standing. Tyrannosaurus rex 's distinction as the largest carnivore was taken away in when a dinosaur encyclopedia of scientists announced they dinosaur encyclopedia discovered the fossilized bones of a previously unknown dinosaur species that had lived about million years ago.
The bones dinosaur encyclopedia six of the dinosaurs were unearthed in Patagonia, a barren region on the eastern slopes of the Andes Mountains in South America.
The scientists estimated that the needle-nosed, razor-toothed, meat-eating giant measured up to 45 feet 14 meters in length.
Like Tyrannosaurus rex, it had a tail and short front legs, but it dinosaur encyclopedia heavier and had slightly shorter back legs. It also was probably more terrifying than Tyrannosaurus rex. Not all of the dinosaurian predators were enormous.
Deinonychus, for example, dinosaur encyclopedia a dinosaur that grew to about 10 feet 3 meters and weighed about pounds kilograms. Deinonychus was one of the so-called "running lizards.
As a dinosaur encyclopedia, Deinonychus was probably a fearsome predator of animals much larger than itself. One of Deinonychus's hind claws was enlarged into a sharp, sicklelike, slashing weapon.
Dinosaur encyclopedia claw was probably used to slash and tear apart its victim. The most infamous small carnivorous dinosaur is Velociraptor, or "swift plunderer. Restorations of this fearsome, highly intelligent, pack-hunting "killing machine" were used in the dinosaur encyclopedia movie Jurassic Park.