A large number of species are whipping out every year, and this has imperil Earth's ecosystem in a way that has never experienced before. Although the protection of animals may seem absurd, while many humans are in a delicate situation; however If the one delve into this issue, in a broad prospective, comes to the understanding, which all species are connected to each other in our ecosystem, similar to a chain, and extinction of some can endanger others. The wolves are hunted by lions, whereas they hunt sheep and If wolves extinct, there would be no food for lions, and sheep will clear all the grass exists, which can cause a dusty storm. So the protection of animals has a chain of benefits, not only in favor of humans but also other species.