1. When it comes to dinosaurs, people often think of fierce Tyrannosaurus Rex or heavy and dull Mamen Xilong; When we talk about birds, we naturally think of light pigeons or colorful peacocks. The two seem to have nothing to do with each other, but a large number of fossils discovered in recent years show that during the Mesozoic era, a branch of dinosaurs underwent a long evolution and eventually became a bird soaring in the air.

Dinosaurs, these strange animals lived more than 200 million years ago. At that time, the earth was covered with vast swamps, deep valleys and hillsides, and there were dense forests everywhere. In this green paradise, there are countless kinds of extremely strange animals-dinosaurs. At that time, these masters of the earth, they wandered around and traveled all over the world.

3. Dinosaurs were the dominant terrestrial vertebrates in Mesozoic, and once ruled the global terrestrial ecosystem for more than 654.38+0.6 billion years. Dinosaurs first appeared in the Triassic period 230 million years ago and died out in the late Cretaceous period about 65 million years ago.

4.？ Liang Long's body is very long, more than 20 meters from beginning to end. He walks like a moving suspension bridge.

5.？ Lei Long is a monster. Its body is as heavy as six elephants. Every step it takes will make a loud noise, like thunder.

Introduction:

Dinosaur (English name: dinosaur)? , is the floorboard of a class of reptiles that appeared in Mesozoic (Triassic, Jurassic and Cretaceous). The vigorous limbs, long tail and huge body are the portrayal of most dinosaurs. They mainly inhabit woodland or open areas in lakeshore plains (or coastal plains).

184 1 year, when British scientist richard owen studied several lizard-like bone fossils, he thought they were left by some prehistoric animals and named them dinosaurs, which means "scary lizards".

The sudden disappearance of dinosaurs at the end of Cretaceous 65 million years ago became a mystery in the evolutionary history of life on earth. This mystery has not been solved so far. In the past, all living things on the earth were recorded in fossils. Many dinosaur fossils have been found in Mesozoic strata. A large number of bones or various shapes can be seen in it. However, in the subsequent Cenozoic strata, there were no fossils of non-bird dinosaurs at all, thus inferring that non-bird dinosaurs died out together in Mesozoic, and now only birds are left. Most scientists agree that "birds belong to dinosaurs".

There are many kinds of dinosaurs, and their shapes and habits are very different. The largest fragile double-chambered dragon may be more than 50 meters, while the smallest hummingbird may be less than 10 cm. As far as eating habits are concerned, there are docile herbivores and fierce carnivores, as well as omnivorous dinosaurs who are both vegetarian and vegetarian. Ruled the earth for about 80 million years (654.38+44 million years ago-65 million years ago).