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Crows don't lay their eggs in sparrows' nests - they lay them in crows' nests. What you're describing, though, here is brood parasitism. This relieves the parasitic parent of the responsibility of rearing young, building nests, protecting the eggs, etc. Brood parasitism is seen in a number of duck species, with females laying their eggs in the nests of ...


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This post is very related to your question and is definitely worth reading. I hope your teacher didn't really say that! It is really not as easy as he's suggesting. There are a number of studies that address the question on whether Sexual Selection (SS) and Natural Selection (NS) have opposite or antagonist effects. The subject is not easy and as SS is not ...



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