Animals that consume other animals are called carnivores. Those carnivores that eat primary consumers are called secondary consumers. Animals that eat secondary consumers are called tertiary consumers, which in turn are eaten by quaternary consumers, and so on. This sequence comprises the food chain. Scientists classify these levels in the food chain according to trophic levels.
Producers make up the first trophic level, primary consumers the second, and so on.
Begin by having students divide charts into four vertical columns and five horizontal spaces using yardsticks and magic markers. Add additional organisms using other references in order to fill out the chart. Consider the placement and role of humans. Identify primary producers, primary consumers, secondary consumers, etc. See below for a partial list of animals featured or mentioned in the program.