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Brood parasites are organisms that rely on others to raise their young. For example, the cuckoo will lay its egg in nests belonging to the reed warbler seemingly with the intent for the warbler to hatch and feed the cuckoo hatchling.

Which of the following identifies the LEAST costly warbler response upon identifying the cuckoo egg to be an impostor?


Destruction of the parasitic egg while in the nest.


Desertion of the nesting site.


Accept the cuckoo egg as one of its own.


Ejection of the parasitic egg.

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