Ключевые слова: alone, animal, animals, asia, borneo, depression, endangered, face, fauna, great ape, great apes, grief, hominidae, indonesia, indonesian, kalimantan, loneliness, lonely, malaysia, malaysian, mammal, mammalia, mammals, melancholy, natural, nature, one, one animal, only, orang utan, orangutan, orangutang, orangutans, ponginae, pongo, pongo pygmaeus, portrait, primate, primates, sad, sadness, serious, sorrow, species, think, thinker, thinking, thoughtful, threatened, wild life, wildlife, zoo,