Ключевые слова: aggression, anger, angry, animal, ape, bars, black, cage, captivity, chimpanzee, dangerous, expression, expressive, frustrated, gesture, gorilla, hang, iron, irritated, jail, locked, male, mammal, metal, monkey, mouth, open, power, primate, prison, sadness, scary, scream, solitude, species, strength, strong, tame, threats, tooth, trapped, wide, wild, wildlife, yawn, zoo,