Ключевые слова: animal, aquatic, aquatic ecosystem, aquatic mammal, beautiful, beauty, biodiversity, blue, cetacea, cetacean, clear, clear water, conservation, deep, dolphin, ecology, elegance, environment, environmentalism, freedom, grace, mammal, marine, marine biology, marine conservation, marine ecosystem, marine life, marine mammal, natural, natural world, nature, ocean, oceanography, peaceful, purity, sea, serene, swimming, tranquility, underwater, underwater world, water, wild, wildlife,