The document defines four types of consumers: herbivores, which eat only plants; carnivores, which eat only other animals; omnivores, which eat both plants and animals; and decomposers, which break down waste and dead organisms. It provides examples for each type of consumer, such as mice and deer for herbivores, sharks and lions for carnivores, pigs and humans for omnivores, and bacteria and fungi for decomposers. Decomposers play an important role by breaking materials down and adding nutrients to soil.