It is the elephant's great desire for food that makes it

　　a disturber of the environment and an important builder

　　of its habitat. In its continuous search for the 300 pounds

　　of plants it must have every day, it kills small trees and

　　underbushes, and pulls branches off big trees. This results

　　in numerous open spaces in both deep tropical forests and

　　in the woodlands that cover part of the African savannas.

　　In these open spaces are numerous plants in various

　　stages of growth that attract a variety

　　of other

　　plant eaters.

　　Take the rain forests for example. In their natural state, the spreading branches overhead shut out sunlight and prevent the growth of plants on the forest floor. By pulling down trees and eating plants, elephants make open spaces, allowing new plants to grow on the forest floor. In such situations，the forests become suitable for large hoofed plant eaters to move around and for small plant eaters to get their food as well.

　　What worries scientists now is that the African elephant has become an endangered species. If the elephant disappears, scientists say, many other animals will also disappear from vast areas of forest and savanna,

　　greatly changing and worsening the whole ecosystem.

　　本文主要讲述的是在非洲草原的生物链中大象的重要作用，它不断的寻找食物拓宽了其他动物的生存空间等。

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