Though there can be many levels of consumers, the important distinctions are between primary and secondary consumers.
Primary consumers are the lowest level of the food chain after the producers. The primary consumers will feed on the producers, making them largely herbivores, such as:
The secondary consumers are predators. These will feed on the primary consumers making them carnivorous in nature. These can then be fed upon by tertiary consumers and so on.
Therefore, we can confirm that the main types of consumers in a food chain are that of primary and secondary consumers.
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