Blog dino
Dinosaurs are a group of extinct animals klad Dinosauria . The first dinosaurs appeared in the Triassic period , about 230 million years ago , and is the dominant vertebrates over 135 million years , which began in the Jurassic period ( about 201 million years ago ) until the end of the Cretaceous period ( 60 million years ago ) , and then perished due to events Cretaceous - Paleogene extinction before the Mesozoic Era . Study of dinosaur fossils suggests that species of birds evolved from theropod dinosaurs during the Jurassic period , and as a result , thousands of species of birds that live now been classified as a sub - group of dinosaurs by paleontologists . Some of the birds that survived extinction 66 million years ago and their descendants continued survival of dinosaurs to the present
Dinosaurs can be classified into various groups of animals from the standpoint of taxonomy , morphology , and ecology . More than 9,000 species of birds are dinosaurs most diverse vertebrates , besides perciform fish . By using fossil evidence , the paleontologists have identified over 5,000 different dinosaur genera , and more than 1,000 species that are not the same as the non - avian dinosaurs . Type of dinosaur in every continent can be determined through a surviving species or through fossil remains . Most of them are herbivores , while the rest are carnivores . Most of the surviving descendants of dinosaurs were bipedal ( two-legged ) , but most dinosaur species is a species that has been extinct quadrupedal ( four-legged ) . Elaborate display structures such as horns or crest is generally shared by all groups of dinosaurs , and some extinct groups also have a distinctive bone structure like thorns and sharp spine . Research shows that lay eggs and build nests are other characteristics shared by all dinosaurs . Although modern bird species are generally small because it adjusts with the ability to fly , most of the pre -historic dinosaurs are large - the largest being Amphicoelias fragilimus of sauropods , with a length of 62 meters ( 203 + feet ) high and 29 meters ( 95 + feet ) . However , the notion that non - avian dinosaurs in general are a huge misunderstanding ; many small dinosaurs , such Xixianykus , whose length is only 50 cm ( 20 inches ) .
Although the word dinosaur literally means " terrible lizard " , but actually dinosaurs are not lizards . Instead , dinosaur classified in a separate group of reptiles . Evidence suggests that the dinosaurs were already extinct in no way reflect the traditional characteristics of reptiles , such as reptiles and ektoterma move . In addition , most of the pre -historic animals like mosasaurs , ichthyosaurs , pterosaurs , plesiosaurs , and Dimetrodon , considered a type of dinosaur , but in fact these animals are not dinosaurs . Throughout the first half of the 20th century , before the bird is recognized as descendants of dinosaurs , most scientists believe that dinosaurs were lumbering animals and cold-blooded . However , studies conducted since the 1970s suggests that dinosaurs were active animals with high metabolic system and perform a variety of adaptations in their social interactions .
Since the first dinosaur fossils were discovered in the early 19th century , a series of dinosaur skeletons have become major attractions at museums around the world , and dinosaurs have also become an integral part of world culture . Large size and nature are considered savage and terrible has led to the emergence of the books and movies hit which tells about dinosaurs , such as Jurassic Park . Public enthusiasm for dinosaurs led to the increased flow of funds to finance the study of dinosaurs , and recent discoveries are regularly covered by the media always .
Dinosaurs in general
By using one of the above definition , then in general , can be interpreted as a dinosaur archosaurus with upright legs under the body . Many prehistoric animals are considered to be dinosaurs , for example [ ichthyosaurs ] ] , mosasaurs , plesiosaurs , pterosaurs , and Dimetrodon , although scientifically animals are not dinosaurs , and none of them were upright posture or having the characteristics of other dinosaurs . Dinosaurs were the dominant vertebrates in the Mesozoic Era , especially in the Jurassic and Cretaceous periods . Other group of animals that live in those very limited number and size ; eg mammals , the amount rarely exceeds the size of cats , and rodents in general are carnivores.
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| Stegosaurus at the Field Museum of Natural History in Chicago |
Dinosaurs were made up of a diverse group of animals ; according to the study in 2006 , more than 500 non - avian dinosaur genera have been identified , and the number of genera preserved fossils have been estimated to be around 1850 , or nearly 75 % of the total dinosaurs remain to be discovered . Past studies have estimated that there are about 3400 genera of dinosaurs on Earth , including the fossil has been preserved . Until 17 September 2008 , 1047 different species of dinosaurs have been named . Most of them are herbivores , carnivores rest , including grain eaters , fish eaters , insectivores , and omnivores . Most dinosaurs walked on two legs ( like modern birds ) , but some species such as archaeological and Iguanodon Ammosaurus could walk easily use two or four legs . Modifications like horns and skull crest is a common characteristic of dinosaurs . Several extinct species also has a protective skin ( like rhino ) . Although known for their large size , there are also some dinosaurs were small , and modern birds belong in this small -sized species . Dinosaurs lived on all continents . The discovery of fossils shows that they spread globally at the beginning of the Jurassic period . Modern birds live in almost every habitat available , from land to the sea , and there is evidence to suggest that some non - avian dinosaurs ( like Microraptor ) could fly , or at least glide.
Source :http://id.wikipedia.org/wiki/Dinosaurus
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