Gargoyles are strongly in tune with the natural cycles of Earth, and there is some evidence that due to the nature of their stone sleep, they may not be capable of living off of the planet. Breeding and Ageing. Like most animals, but unlike most mammals, they lay eggs. Female gargoyles nurse their young with breastmilk, however. [14] Gargoyles and humans are not capable of reproducing together without the aid of science or magic. [15] For more information on gargoyle reproduction see this entry.