Food Chain Ecosystem

One Particular interesting food chain ecosystem I found was a forest. First there's grass, a grasshopper eats the grass. Next the toad eats the grasshopper. After that the snake feeds on the toad. Then finally the hawk gets the best of the snake. Then bacteria of decay takes place. This chain happens over and over time and time again. Without certain animals in the forest others wouldn't be able to live. They are dependent on each other.