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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
An obligate parasite, or holoparasite, is a parasitic organism that cannot complete its life-cycle without exploiting a suitable host.If an obligate parasite cannot obtain a host it will fail to reproduce.This is opposed to a facultative parasite, which can act as a parasite but does not rely on its host to continue its life-cycle.f an obligate parasite cannot obtain a host it will fail to reproduce. This is opposed to a facultative parasite, which can act as a parasite but does not rely on its host to continue its life-cycle.