Butterflies (Lepidoptera) and beetles (Coleoptera) are the animal orders which are richest in species. 140,000 different kinds of butterflies and 350,000 kinds of beetles are known, and a huge number of new species from the tropical rain forests are waiting to be discovered and described. Despite there being so man are no known blood-sucking butterflies or beetles. The skin symptoms, one can get from these animals is partly caused by defense mechanisms against their natural enemies.
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