close-up portrait of a gorilla with a wistful expression

primate mammal animal ape monkey wildlife gorilla macaque zoo chimpanzee head nose close-up portrait silverbgorilla wistful expression silverback glancing making eye contact africa african animal animals ape apes beast big black captive congo emotion endangered endangered species expression face forest fur gorilla conservation gorillas hairy head jungle lowland male mammal monkey mountain nature portrait powerful primate sad safari silverback strong thoughtful tropical western wild wildlife behavior documentary zoo zoology