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Â¥Ö÷×îºóÓÐÏÂÎÄÁËû£¿µÈ×ÅÌýÄãµÄ°ì·¨ÄØ¡£Nparks => Asian Koel
the Asian Koel deposits its eggs in the unattended nest of a house crow, sometimes removing one of the host¡¯s eggs in the process. The Koel chick hatches first and may force the host¡¯s eggs or chicks out of the nest.
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Wiki => Brood Parasite
The host may be the one that ultimately ends up raising offspring after they return from foraging. Once parasitism has occurred, the next most optimal defense is to eject the parasitic egg. According to parental investment theory, the host can possibly adopt some defense to protect their own eggs if they distinguish which eggs are not theirs. Recognition of parasitic eggs is based on identifying pattern differences or changes in the number of eggs.[18] This can be done by grasp ejection if the host has a large enough beak, or otherwise by puncture ejection. Ejection behavior has some costs however, especially when host species have to deal with mimetic eggs. In that case, hosts will inevitably mistake one of their own eggs for a parasite egg on occasion and eject it. In any case, hosts will sometimes damage their own eggs while trying to eject a parasite egg.
Among hosts not exhibiting parasitic egg ejection, some will abandon parasitized nests and start over again. However, at high enough parasitism frequencies, this becomes maladaptive as the new nest will most likely become reparasitized. Other behavior can include modifying the nest to exclude the parasitic egg, either by weaving over the egg or in some cases rebuilding a new nest over the existing one. For instance, American coots might kick the parasites¡¯ eggs out, or build a new nest beside the brood nests where the parasites¡¯ babies starve to death due to lack of food
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