Ключевые слова: alone, animal, ape, bars, behind, brown, cage, caged, captivity, captured, chimpanzee, environment, environmental, escape, exhibit, face, fence, freedom, hairy, hands, iron, jail, locked, lonely, look, macaque, mammal, metal, monkey, monkeys, natural, nature, primate, prison, sad, sadness, solitude, thailand, wild, wildlife, zoo,