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When an animal dies, it still has valuable nutrients stored in its body. Helping return these nutrients to the ecosystem are detritivores and decomposers, both of which feed on dead organic matter. Detritivores, such as worms and some millipedes, eat and internally digest small chunks of dead organic matter. Decomposers, in contrast, often don’t have mouths, so they must externally digest the dead organic matter. They break the matter into simpler parts, often dissolving it, and then absorb the broken-down matter. Fungi and bacteria are examples of decomposers. By breaking down dead organic matter, decomposers return some nutrients directly to the ecosystem. Other organisms also eat detritivores and decomposers, and nutrients return to the ecosystem in this way, too.
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