Consumer Definition:
One Who Must Eat Others to Survive  

Consumer Definition: An organism that needs to eat other organisms for energy in order to survive.  As long as you eat other organisms, you are a consumer.  Therefore, humans are consumers.

“humans are consumers”

20160525 consumer definition

(click to enlarge)Examples of Consumers:
Some consumers eat producers.  For example, deer eats grass for food.  However, some consumers actually eat other consumers!  For example, wolves eat deer for food.

The words “primary”, “secondary”, and “tertiary” describe where the consumer is located in the food chain.  The primary consumer is one that eats producers and is at the lowest level of the food chain.  Secondary consumers eat primary consumers, and tertiary consumers eat secondary consumers.

Next Generation Science Standards:

HS-LS2-4  Use mathematical representations to support claims for the cycling of matter and flow of energy among organisms in an ecosystem..

HS-LS2-5  Develop a model to illustrate the role of photosynthesis and cellular respiration in the cycling of carbon among the biosphere, atmosphere, hydrosphere, and geosphere.

What Science Does this Comic Teach?

Unit: Anatomy

⇒Chapter: Immunology

⇒Topic: Consumer Definition

Additional Information

Food Chain

It is a diagram that shows the “who eats who” relationship in an ecosystem / environment.


An organism that makes its own food, whether by photosynthesis or chemosynthesis.  Another way to call a producer is an autotroph.

Primary Consumer

A consumer that eats producers for food.

Secondary Consumer

A consumer that eats primary consumers for food.

Tertiary Consumer

A consumer that eats secondary consumers for food.

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