Common Cuckoo chick ejects eggs of Reed Warbler out of the nest.

mecano04

Thanks for all that info. I am not very knowledgeable on the issue but I read that certain birds derive some benefits out of brood parasitism. Cuckoo's eggs have a certain smell that keeps many predators away and so many times crows eggs get saved because of that. But I didn't read any proper article but just youtube comment.