A producer is an organism like a plant that generates food and energy for the ecosystem, such as carrots, grasses, and wheat.

A consumer is a heterotroph that relies on other organisms for food.

A primary consumer is an animal like a rabbit that eats producers.

A secondary consumer is an animal like an owl that eats primary consumers.

A tertiary consumer is an animal that eats secondary consumers, such as foxes when they eat birds.

Yes, some animals can occupy more than one role.

For example, birds are primary consumers when they eat wheat but secondary consumers when they eat grasshoppers.

A herbivore is an animal like a grasshopper that only consumes producers.

A carnivore is an animal like an owl that only eats other consumers.

A top carnivore is a carnivore that is not predated within that food web, such as foxes.

An omnivore is an animal like a bird that eats both plant and animal matter.