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Thus, it is quite probable that at the heart of extinction of dinosaurs, as well as other mass vymiraniye occurring in the history of Earth the difficult complex of evolutionary transformations of a plant and animal life, and also the physical events connected with changes of the area and outlines of sushi and sea, orogenic processes, distribution of temperatures, winds and oceanic currents lies.

There lived once a dinosaur, the krutoloby which got a nickname. It had a 8 - 10 centimeters thick cranial cover. This feature belongs to those few data which, perhaps, throw some light on marriage life of ancient animals.

In late chalk the difficult ecosystem which dinosaurs entered, included also floral plants, many types of insects, lizards, snakes, turtles, crocodiles, and also the flying reptiles and birds. At it there were also very small mammals. With the termination of the Cretaceous extinction of dinosaurs sharply changed this dynamic biota.

Dikreozavr – Dikreozavr was zauropody rather modest sizes and one of the most ancient members of family. In comparison with late forms, it had a short neck and a tail, and rather large head. In his vertebras it is also possible to note some features, for example, there were unusual, Y-shaped thorns on all length of a back and on a neck. Perhaps, they formed clearly a visible crest.

Amargazavr had the thin hlystopodobny tail and stupid teeth adapted for a foliage obryvaniye from branches. As well as other zauropoda, he probably swallowed of stones, or gastrolita to help digestion of food. The shipasty backbone reminded a dikreozavr, and some paleontologists allocate this two look in special family.

The scientists who made this hypothesis proceed from similar behavior of modern mountain rams who butt, challenging superiority. As there is basis to believe that stegotserosa led a gregarious life, thick foreheads, perhaps, were the same symbol of situation in herd, as the big horns of modern rams helping them to approve the dominating situation.

The longest dinosaurs known belonged to us to family of Diplodocuses on the whole skeletons. Diplodocus. The most studied sort, grew to 27 m, but the incomplete skeleton of a seysmozavr shows that there could be Diplodocuses more long. If so, they were the longest vertebrata in the history of the earth. Diplodocuses were put as live suspension bridges, with columns – the paws, extremely long necks and longer tails which are narrowed by the end. Despite the big length, they were not so heavy, as many zauropoda because their skeleton was arranged on – special for economy of weight. They had extended heads, large nostrils on most above at eyes and teeth, unusually small, similar to pegs.

– doubts that Ultrazavros is a separate genus of dinosaurs Expressed, so kA it is possible that his remains – mixture of bones of two other dinosaurs, a superzavr and the brachiosaur. Judging by these remains, height of an ultrazavros to shoulders was 8 m, that is is four times more than human growth.

Paleontologists consider that dinosaurs were brilliant failure of the nature. Failure for biological evolution is expressed in extinction. 130'000'000 years, dinosaurs disappeared from the face of the earth and did not leave posterity. But it is possible, they still will declare themselves?

In my paper has two chapters the first about dinosaurs, generally, about appearance of dinosaurs when people learned about dinosaurs, species of dinosaurs, habits of dinosaurs, the end of an era of dinosaurs. The second about families of Diplodocuses about their types and the surprising facts.