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Now listen to a lecture on the same subject: Brood parasitism is a very interesting and peculiar evolutionary phenomenon whereby a parasite organism leaves its offspring to be incubated and cared for by a host organism. The parasite organism typically accomplishes this by manipulating or tricking the host into believing that the parasite brood is, in fact, the host brood. The host organism will then care for this parasite brood, which is usually at the detriment of the host brood as both broods compete for nourishment and survival. Brood parasitism behavior has been widely observed among birds, fish, and insects. Let me give you an example so you can better understand this phenomenon. Fish A is the host organism, while Fish B is the parasitic organism. Fish A lays eggs in the water, and after fertilization, the eggs are stored safely in the mouth of Fish A during the incubation period. Storing the eggs inside the mouth provides a safe environment for the eggs to incubate as the chance of predation is greatly diminished. Fish B, the parasitic organism, also lays and fertilizes their eggs and hides them amongst the eggs of Fish A. Fish A unknowingly takes both broods into its mouth and incubates them. This has relieved Fish B parents from any responsibility of incubating, protecting, or nourishing their young because Fish A has been successfully tricked into caring for both broods. Fish B have more time to spend looking for food and producing more offspring, while Fish A is stuck with the burden of looking after the offspring.