Organisms may interact with one another in several ways.

One example of an organism interaction is that of a producer/consumer relationship.

A producer is any organism capable of making its own food, usually sugars by photosynthesis.

Plants and algae are examples of producers.

A consumer is any organism which eats another organism.

Several different types of consumer organisms exist.

A herbivore is a consumer which eats primarily plant material.

A deer is an example of a herbivore.

A carnivore consumes primarily animal material.

An omnivore eats both plant and animal matter.

Humans are examples of omnivorous organisms.

A predator is a type of carnivore that kills its food.

The organism the predator feeds upon is called its prey.

A wolf and rabbit would provide an example of a predator/prey relationship.

Scavengers feed upon organisms that other organisms have killed.

A crow feeding off dead carrion in the highway would be an example of scavenger in this instance.