: Because they are so large, the "chunky" chicks often out-compete the host's actual offspring for food, sometimes even pushing host eggs or smaller chicks out of the nest to ensure their own survival. Key Evolutionary Tactics Egg Mimicry
The phrase "pgd954 tour of out chunky brood parasite in be full" appears to be part of a low-quality or autogenerated text string rather than a standard scientific or birding term
Thus, this article is your —their evolution, tricks, and the arms race they’ve sparked with their hosts. No PGD954 required (probably a serial number or auto-fill error).