Search for dinosaurs

Prehistoric reptiles, known as Middle Triassic dinosaurs in the late Middle Ages, were created about 230 million years ago and were members of a subset of reptiles called archosaurs, or reptiles, a group that also includes birds and crocodiles. Scientists first studied dinosaurs in the 1820s and discovered the bones of great terrestrial reptiles called Megalosaurus or the great lizard buried in the English countryside.

In 1842, Sir Richard Owen, one of the leading British paleontologists, coined the term "dinosaurs". Owen examined the bones of three different creatures, such as Hylaeosaurus or an orchid, each living on the ground and was larger than any live reptile, walking directly with their legs Instead of going out on the sides, three vertebrae at the hips were located under their bodies, unlike other known reptiles. Meaning orchid or reptile.

Dinosaurs are from

Dinosaur fossils have been discovered around the world and have been studied by paleontologists to learn more about the different types of these creatures. Scientists have traditionally divided dinosaurs into Ornithischia and Saurischia, followed by several species of dinosaurs. Triseratops) and each genus belonging to one or more species. Some dinosaurs had two feet, that is, they walked on two feet, some walking on four legs. Some were able to move from one another to the other, some dinosaurs being covered with a kind of protective armor. For the feathers probably resembled those of modern birds: some walked quickly, others slowly, most dinosaurs were herbivores or herbivores, but others were carnivores, hunted or dispersed by dives. other dinosaurs to survive.

At the origin of the dinosaurs, all the continents of the Earth were interconnected in a single mass, now known as Bangia and surrounded by an immense ocean. Bangia began to collapse in the early Jurassic (about 200 million years ago) and the dinosaurs had undergone changes. Great in the world where they lived, the dinosaurs mysteriously disappeared at the end of the Cretaceous, about 65 million years ago, and many other animal species have died, as have many species almost at the same time. Extinction of sex J, in addition to the great volcanic or tectonic activity that took place at the time.

Scientists also discovered that a giant asteroid had hit the Earth about 65.5 million years ago, had lost 180,000 billion tons of TNT and released a huge amount of ash. On the surface of the Earth, deprived of water and sun, plants and algae perished The planet, after a period of survival on the carcasses of these herbivores, carnivores also died.

The extinction of dinosaurs

Despite the fact that dinosaurs no longer walk the earth as they did in the Middle Ages, the undeniable effects of these huge reptiles can be identified in their descendants and modern birds. Dinosaurs also live in the study of paleontology, Finally, because of their frequent appearances in movies and television, dinosaurs dominate the popular imagination and a world shows no danger of disappearing: the smallest dinosaurs have was officially appointed in 1841 by archaeologist Sir Richard Owen. "Tribe A For the distinct order or suborder of the reptile" recognized in England and throughout the world, the term is derived from ancient Greek (Dino), meaning "terrible and strong or tall, and pictures", "orchid or "Reptile", although the name of the classification is often interpreted as "It is a reference to dinosaur teeth, their claws and other scary features, but Owen does not". was meant to evoke its size and magnificence.

Birds are now considered the only species of dinosaurs still alive, while most contemporary paleontologists interested in dinosaurs reject the traditional method of genetic classification. In order to constitute a natural group, all the descendants of the members of the group must also be included in the group, so that the birds are considered dinosaurs and that, therefore, the dinosaurs are not extinct. The birds are classified in the subgroup of T a dinosaur.