Nowadays, extinction animal species has become one of the environmentalist concerns and they are worried about its consequences for ecosystem. Some people argue this issue must be prioritized for the government, while other people believe there are a lot of problems for human beings which are more important than animal preserving. In this essay, we will discuss both points of view in depth. In my opinion, both perspectives are valid and they should be taken into consideration but human problems are more important than animal species extinction. To begin with, it is obvious that preserving animal species from extinction has a lot of positive benefits for environment and even people's lives. When one specie dies out it affects on other species lives; for example, in some habitats when one of bird species become extincted it leads to an increase in the population of other species which was that bird's prey. Therefore, increasing in number of certain specie cause a lot of problems for t...