Ключевые слова: aggression, aquatic, battle, behavior, break, brute, challenging, combat, confrontation, creatures, dawn, day, display, dominance, early, encounter, environment, fierce, fighting, force, hippopotamuses, instincts, intense, jaws, large, light, mammals, massive, morning, murky, natural, nature, position, power, powerful, presence, rivalry, river, riverbed, scene, spectacle, splash, strategy, strength, struggle, submerged, sunrise, survival, teeth, territorial, territory, two, water, waters, wild, wildlife,