The diversity of species, each species has its own unique genetic information, limited by scientific development, is not fully understood at present, so we should protect it. The other is that the whole earth is a huge biosphere, and all living things are part of this whole. After millions of years of evolution, it has formed such a stable state. The extinction of species will cause the destruction of steady state, which will cause great or small adverse effects. A simple example, just like the extinction of wolves will cause rabbits to multiply, and the proliferation of rabbits will cause grassland desertification.
The extinction of wild animals has a great impact on human beings and even the earth. Simply put, the existence of mice, for example, is only part of the ecology. If rats become extinct, the animals they feed will shift the food chain. Cats are omnivores, and they can play and eat whatever they can catch. The food types of animals such as owls or snakes will also change. If one food is missing, change it. If all the food is extinct, then the species will gradually become extinct.