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Answers. 1  A food chain is the what animal eats what animal. It really should be called a food web because many animals eat many other animals. The food web is a representation of an energy pyramid. An energy pyramid just shows where the energy is going. The sun is at the bottom, then plants and so on. There really are not many differences between them.
The energy pyramid shows predators and prey. At the bottom, there is the most common and most available food/energy source. (This is usually sun or grass/plants). The next level up is a predator that eats the grass, or uses the sun. This would be an insect, most likely, such as a grasshopper that eats the plants. Or, this would be the grass that uses the sun's energy to make food. Anyways, the energy from one organism is transferred to the next organism. This chain continues on (bird eats grasshopper, snake eats bird, and hawk eats snake). Therefore, the hawk now had all of the energy of the sun, grass, grasshopper, bird, and snake. The hawk is the top predator, and would be at the top of the pryamid.