Ключевые слова: african, aggression, aggressive, aggressiveness, amphibius, animal, antagonistic, battle, behavior, black and white, bw, dangerous, displaying, dominance, domination, dual, fierce, fighting, hippo, hippopotamus, huge, intense, large, mammal, monochrome, mouth, nature, nobody, open, river, splashing, spray, two, water, wide, wild, wildlife,