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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
From Wikipedia, the free encyclopedia. A facultative parasite is an organism that may resort to parasitic activity, but does not absolutely rely on any host for completion of its life cycle. Examples of facultative parasitism occur among many species of fungi, such as family members of the genus Armillaria.