A system of interlocking and interdependent food chains is called the food web. A food chain is a linear network of links in a food web starting from producer organisms and ending at apex predator species, detritivores, or decomposer species. A food chain also shows how the organisms are related to each other by the food they eat. Each level of a food chain represents a different trophic level.
The consumer trophic level can be subdivided depending on the kind of organisms included. Immediately above the producers are the herbivores, organisms that eat plants only. The consumer trophic level can be subdivided depending on the kind of organisms included. Immediately above the producers are the herbivores, organisms that eat plants only. Some common examples of herbivores include squirrels, rabbits, mice, deer, cows, horses, sheep, and seed-eating birds.