A food chain demonstrates what different species of animals present in an ecosystem eat, and are eaten by. The start of the food chain is a producer - an organism which makes food. This is generally a plant, which produces energy through photosynthesis. Things that eat the producers are called consumers. These are animals that eat the plant. There may be many consumers in a food chain, which eat the consumer below them in the chain . A good example of a British food chain would be that of grass, rabbits and foxes. GRASS > RABBIT > FOX Grass is the producer, as it uses photosynthesis to produce its own food. Rabbits are the primary consumers. They only eat grass and other plants, making them herbivores. The fox is a secondary consumer. The fox is a predator of the rabbits. The rabbits are the foxes prey. Because their diet is made of meat, they are carnivores. Other animals, such as humans might be reffered to as omnivores as they eat plants and animals.