Answer:
Parasitism
Step-by-step explanation:
This type of relationship is the brood parasitism, a clear example of the parasite-host relationship. Instead of building their own nest for their living, the cuckoo will lay their eggs in what is known as reed warbler’s nest. This leaves the warbler to take care of the egg together with her own children. When the eggs get hatched, the chick of the cuckoo will then ejects the young of the warbler from the next, which paves way for it to get all the food that its adopted mother will provide.