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What purpose do pests like cockroaches serve?

Dear Jane,

There are 4, 000 varieties of cockroach of which only 10 are considered pests. They are omnivore scavengers that clean up our environment and help recycle the organic litter that would accumulate if it were not decomposed by organisms, including cockroaches. They serve to recycle human waste. If they did not exist, the pile up of human waste would be so large that we would die in the filth. They turn all the leaves and paper into soil. Furthermore, they serve as food for small mammals, birds, amphibians and lizards.