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The English word "no food chain" refers to the food network relationship formed by the mutual restriction and interdependence of organisms. For example, the carnivores-herbivores and insects-birds in the grassland ecology. They restrict each other. They thrive and thrive. The relationship between them is a unity of opposites and a natural harmony. In the African savannah, carnivores represented by lions, cheetahs and hounds specialize in eating herbivores. Their hunting of wildebeests and even zebras is brutal. But this Cruel hunting is not only a need for carnivores to survive and reproduce, but also an essential factor to maintain the lushness of grassland plants and ecological balance. If there are no carnivores to control herbivores, herbivores will develop rapidly. When herbivores When the number of animals reaches a certain level, the grassland will be unbearable. The grassland will degrade, and herbivores will lose the conditions for survival and development. The killing of herbivores by carnivores can not only control the number of herbivore populations, but also in a sense. It is said that it also improves the quality of herbivores. Biologists have proven through long-term field investigations that during the hunting process, carnivores often select sick and weak herbivores. This is undoubtedly conducive to the survival of the fittest. From this point of view, the ferocious hunting of herbivores by carnivores seems natural and reasonable. Carnivores feed on herbivores, which protects the grassland while controlling the population of herbivores. Various birds have a strong influence on insects. Predation is the same as carnivores. It also plays a role in protecting the grassland. The feces of birds and animals become good fertilizers and promote the growth of various plants. This kind of plant-based animals, herbivores, carnivores and insects-birds The food chain formed by the object plays an important role in maintaining the ecological balance of the grassland. The Hulunbuir Grassland is one of the largest grasslands in northern my country. It has abundant pasture and herds of cattle and sheep. It is the largest animal husbandry base in my country. However, historically, the large number of wild wolves here has posed a serious threat to the development of animal husbandry. In order to protect the safety of people and livestock, local herders once organized large-scale hunting activities for wild wolves, which caused a sharp decline in the number of wild wolves. The few wolves no longer dared to call the grasslands their home and feed on cattle and sheep. They all moved to the deep mountains and old forests. The wild wolves disappeared. The animal husbandry industry developed unprecedentedly. While the cattle and sheep populations continued to increase, the hare It developed at an alarming rate. Rabbits, cattle and sheep competed for pasture. The grassland was difficult to carry, leading to rapid degradation of the grassland and putting the grassland at risk of desertification.

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