Animals Pics: The living creature diversity is so huge that no one would probably manage to count them all. One of the reasons is that many species die out without leaving a trace and we will never find something out about their existence: unfortunately, the loss of species, families and even units is the common phenomenon in the evolution process as the new species emersion. The second reason is that we don’t even know completely the actual animal diversity: there are new species and even families emerging annually.
The up-to-date mammals count at least 25 units, 140 families and 4600 species. This is only the smallest part of the whole species diversity. The whole number of species of animals reaches about five million, the two-thirds of which are the insects! Moreover, some other vertebrate classes have got even bigger diversity. For instance, people know around 5000 species among birds and about 20, 000 species of fish. Even if take these several thousands of actual animals and add the extinct ones as twice or three times diverse we will still get a small quantity that will hardly be more than 15 thousand, throughout the whole, 200 million year animal evolution.
Most animals inhabit the tropical areas. This is the very place where most species live. If to take the Russian fauna world, to be more precise the temperate and cold climate regions, the mammal class can hardly represent 8-9 units of animals, and more than 40 families of 310 species. Moreover, only few scientific taxonomists, who study the flora and fauna diversity, can tell the exact numbers. Almost every year emerge some new species that were unknown before. And when you start studying their family ties, it always leads to the point that their genus, families and even animal units should be also specified.