The cuckoo is a bird that never hatches eggs on its own, but throws them into the nests of other birds. Everyone knows about this, but the reason for this behavior is known to few. Naturally, we are not talking about moral principles.
The reason is purely biological. 
This bird belongs to the insectivorous birds and among them it is the largest. To feed an adult, a lot of food is required. Adults simply cannot feed the chicks. It is quite difficult for a bird to hunt for prey, and this is due to its size. The larger it is, the harder it is for it to maneuver in the air, and the more food it requires. 
It is much easier for those birds that feed on grain to feed themselves, raise offspring, and make supplies. The cuckoo does not have such an opportunity, so it throws eggs into other people's nests.
How do small birds cope with cuckoo chicks? 
The mother cuckoo lays only one egg in the nest of her choice. The baby cuckoo is born and simply throws all the other eggs out of the nest. As a result, the parent birds feed only one chick, and they are able to do this. 
This process is modeled by nature. If this species of birds did not lay eggs, and other relatives did not hatch and feed other people’s chicks, then we would not even remember the cuckoos, since they would simply die out. 
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