Ключевые слова: alone, animal, animals, ape, background, bars, be sad, behind, black, brown, cage, caged, captivity, chimpanzee, concept, detecting germs, eyes, face, fence, foot, forest, freedom, green, hand, head, hope, infection, laboratory, looking, macaque, mammal, marmoset, metal, monkey, monkeys, natural, nature, old, park, pity, primate, prison, sad, sadness, tattoo, thailand, wild, wildlife, young, zoo,