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This article focuses on the benefits of parasites to their hosts, and discusses studies that found evidences of an upside to parasites, the relationship of species with its parasites and parasitic extinction.

The article focuses on the viruses and other parasites that attack the brain system of their hosts making it in the zombie-like state. It mentions that wasps used to live in the brain of a spider and manipulate the spider's behavior. It mentions that Pennsylvania State University's scientist David P. Hughes along with his group found that a gene from caterpillar known as egt produces enzyme that damage hormones and give the caterpillar a signal to stop eating and shed.