Similar plates were available already for ancestors of dinosaurs and their relatives, crocodiles. It is possible to assume what exactly such type of skin was widespread at dinosaurs. At armor-clad pangolins bone plates gained the greatest development. Their thickness reached 5 cm; they settled down in dense to each other from above and on each side bodies, forming a strong, but flexible armor. It was covered by a layer of the horn skin creating the drawing similar to a tiled mosaic. On peaked or curved bone plates horn skin strengthened these forms, creating thick peaked horns or hillocks.
Later armor-clad dinosaurs are subdivided into 2 groups: harmonous uzkogolovy with a peaked tail (nodozavra) and a leaky armor-clad board and stocky shirokogolovy (ankilozavra) with a thickening on the end of a tail in the form of a mace.
Judging by a shape of a brain cavity of a skull, also utkonosy dinosaurs differed in good sight, hearing and sense of smell. These feelings were especially necessary for the herbivorous pangolins who do not have an armor in due time to distinguish the enemy.
Dinosaurs postponed eggs. Considering that they were reptiles, it was assumed still before their eggs were found. Also that in size they could not be more opening in a basin of females through which had to pass was clear. But which were these eggs, scientists could learn only on the basis of the first finds.
Skin belongs to those parts of a body which do not turn into fossils and do not remain for ages. However to researchers nevertheless has the luck to find some its prints. So, for example, it was found (a duck pangolin). He was lost during a sandy storm and was buried under dry sand. Skin of an anatozavr was smooth, dry and strong, and between its soft folds small convex sites of thicker horn skin were allocated. Under these thickenings in skin small bone plates were located.
So far 30 species of armor-clad dinosaurs are known already. The majority of them lived in the end of the Cretaceous. And their ancestor, (the dismembered pangolin) appeared on 100 million years earlier. Its armor consisted of the bone plates and thorns forming seven rows along all body. The pangolin 3,5 meters long ate, apparently, ferny and palmoobrazny sagovnikovy plants.
But together also some species of small predatory dinosaurs kept. It is confirmed by nineteen identical traces with an average length of a step located closely to each other on one platform. Means, these animals also hunted herds. At large, heavy predatory dinosaurs only single traces still met.
Apparently, leather of dinosaurs reminded on the structure skin of three groups of modern reptiles - turtles, crocodiles and klyuvogolovy. However it is impossible to tell, whether there was it a scaly cover or skin like snake.
Finds the hardened prints of traces and massive congestions of bones serve as the proof of that some dinosaurs lived herds. Prints of traces can tell a lot of things to the professional researcher of behavior of animals.
Means, cubs quite long time were in a nest (they also crushed a shell) under protection of mother who fed them. This utkonosy dinosaur called a mayazaur (a maternal pangolin). Females weighed at least two tons and could hardly hatch out eggs. Most likely, the plant material going for construction of a nest when rotting allocated heat sufficient for development of a germ in egg.