As the animals mature, the hair turns gray. Males acquire silver-gray saddles across their backs and upper thighs at sexual maturity, earning them the name silverback. Newborns initially have pinkish-gray skin which quickly darkens. They frequently have a white rump patch until a few years old. E. Learning capacity.
All great apes exhibit a capacity for complex learning.
In behavioral research facilities, some gorillas have learned sign language and formed very simple sentences to communicate with people. Chimpanzees have been observed creating tools from their environment and then using them to accomplish certain tasks such as probing for termites with sticks or gathering water for drinking with crumpled leaves. Young chimps learn these behaviors from watching other chimps. Gorillas have not been observed making or using tools in the wild.