Ключевые слова: algae, amazon, amazon river, amazonia, animal, aquatic, beauty, biodiversity, brazil, danger, dark, discovery, ecosystem, environment, exotic, exploration, fauna, fish, freshwater, green, group, habitat, light, natural, nature, peaceful, piranha, predator, river, scary, scenic, serene, serrasalmus, shoal, shoaling fish, south america, sun rays, swimming, teeth, tropical, underwater, water, wild, wildlife,