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Another example is the cockoo bird which leaves its young with a host to raise. This type of parasitism is often called brood parasitism. Terry Spivey, USDA Forest Service, www.forestryimages.org
A parasite is an organism that lives on or in a host organism and gets its food from or at the expense of its host. There are three main classes of parasites that can cause disease in humans: protozoa, helminths, and ectoparasites.rotozoa. Protozoa are microscopic, one-celled organisms that can be free-living or parasitic in nature. They are able to multiply in humans, which contributes to their survival and also permits serious infections to develop from just a single organism.