Food chain
A 'food chain' shows the feeding relationship between different living things in a particular environment or habitat. Often, a plant will begin a food chain because it can make its own food. Organisms that can make their own food are called producers. Consumers are animals that eat producers or other animals. The animal that eats the producer is called the primary consumer. The animal that eats the primary consumer is called a secondary consumer. The animal that eats the secondary consumer is called a third order consumer and so on to fourth, fifth, etc. The direction of arrows between the organisms shows who eats what.