Dinosaurs 

What is the difference between dinosaurs and other reptiles? Now, this answer is roughly very easy to explain, with all dinosaurs the legs are in such a way arranged that they perpendicularly downward and not like reptiles stand to the side. This arrangement brought crucial advantages for progressive movement and further development. In addition all dinosaurs were land organisms, could thus not fly or did not live not in the water. We would not go deeper this moment in the development of the dinosaurs, this comes later. Dinosaurs are divided in two groups, the Saurischian and the Ornithischian.

Many scientists are meanwhile the opinion, it make no more sense to seize both groups of dinosaurs together. The reasons for this are different which we  here would not like to describe in the detail. We remain for the time being the old organization around for not confusing unnecessarily our readers. Some of these "new rules", is unfortunately so much confusing, an extensive book is needed around this to describe. Where thus is the simplest difference between the two groups? Now, the most remarkable is probably the shape of the pelvis. With the Saurischian (reptile pelvis) the pelvis bones are characteristically recognizable, since they are nevertheless separate from each other, but at the basis being connected.  

Confuses? It is not so heavy.

We begin with the Saurischian. Of the Ilium which is with the spinal column grew together, go like a beam the Ischium forward, and the Pubis to the rear, toward the tail away. These pelvis bones show all, up to the Ilium, downward and are all together present in pairs. These bones make it possible the large leg muscles could to increase. The Saurischian then still further divided into Theropoda (thus almost all two-legged dinosaurs), and Sauropodomorpha (all dinosaurs with long necks, ton-shaped bodies and column-well-behaved legs). 

The Ornithischian is differentiated likewise mainly at the pelvis. With them however the Ischium and Pubis seem with one another to have grown together (what they really not be). These bones are present likewise in pairs, and all show downward toward the tail. One can describe the Ornithischian roughly in such a way, as that all herbivores up to the Sauropodomorpha among it rank. The Ornithischia then still further divided into: Ceratopia (all dinosaurs with neck collars), to Pachycephalosauria (all with a characteristic bulge of the head cover), Ornitopoda (that is a very large group, to those for example Iguanodon or also Parasaurolophus counts), also the Ankylosauria (those are all dinosaurs those the almost whole body armored and a heavy bone club at the tail end to often carry), and in the end the Stegosauria (all dinosaurs the rhombic bone plates on the back carry, the most well-known are Stegosaurus).

All these groups are ever continued to partition, until one finally comes to the individual animals, as for example Tryrannosaurus rex or Triceratops horridus. The second name says then finally around which animal it acts. They know itself so a presenting, as if the front name is the actual surname, and the appendix the first name is, in order to differentiate between the animals better. Taxonomy is surely not easy to understand, but we hope we could them some which understandable to describe. 

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