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There are basically three levels of consumers: primary, secondary and top level consumer.

Primary consumers include organisms which feed on the producers, that is to say, green plants. Herbivores are included under this category.

Secondary consumers include those organisms which feed on primary consumers. They indirectly derive nutrition from the producers.

Top level consumers are those which feed on either primary or secondary consumers or both.

consider a food chain like this:

plant -> rat -> snake -> predatory bird

in this food chain, the first level consumer is rat(herbivore) while snake is second level(carnivore) and finally a predatory bird which feeds on both rat and snake, which makes it a top level consumer.

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