Crocodilia (or Crocodylia) is an order of large reptiles. They are the closest living relatives of birds, as the two groups are the only known survivors of the Archosauria.
The correct vernacular term for this group is "crocodilians" and it includes the alligator, caiman, crocodile, and gharial families. The term 'crocodiles' is sometimes used to refer to alligators and caiman, or even their distant prehistoric relatives, "marine crocodiles".
Source: en.wikipedia.org/wiki/Crocodilia - 19.09.2009
Although the body shapes and the body surfaces of the animals are different, we always find – as with the Crocodile – symmetry and a respectively specific harmony.
Here and the same manner in the flora and in the lifeless parts of nature we can see, that originality and diversity have to do with ingenuity and not with chaos, arbitrariness and the attempt to be outstanding.