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The requirement of eviction actions is unclear. Just one speculation is usually that competing with host chicks causes diminished cuckoo chick pounds, which can be selective stress for eviction habits. An Examination of the amount of meals furnished to frequent cuckoo chicks by host mother and father in the presence and absence of host siblings showed that when competing versus host siblings, cuckoo chicks did not acquire enough foodstuff, displaying an lack of ability to compete.[34] Choice pressure for eviction conduct might come from cuckoo chick