Animal species There are many animal species on the Earth. Some of them live with humans, while others live in the wild. Concerning the matter of habitats, we classify animals into two main groups: domestic animals and wild animals. The domestic animals are animal which live with humans. They are fed by humans at the aime of shake of human: for food, for labour force, fo decoration... beacause they live with human, they have lost thier instints in the wild. The become more friendly. The wild animals lice saparate to humans tin the wild. They survive according to its own rules and limits, and do not rely on humans to provide for them. They rely on thier instints . Wild animals are difficult and impossible to care for. They often grow to be langer and stronger and more dangerous than domestic animals. By nature self-sufficient, wild animals can fare best without our interference. Classification of animals is a key to understand similarities and differences between wild animals and domestic animals. We can also distinguish and make subgroup.