this is a very interesting behavior. many brood parasites will lay eggs in the nest of much smaller birds so the adults end up struggling to feed young birds far bigger than themselves. the koel is not so unabashed. interesting fact: according to wikipedia the oldest record of brood parasite behavior is in a 4000 year old sanskrit text describing the koel. the sanskrit name for this behavior is anya-vapa translated as "sown for others to reap".
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Wow how interesting, the cowbird lays eggs in smaller birds nest, so that means for the hatchlings of the parent bird usually die due to neglect.