Grass floats in a river in the United States. River habitats, called riparian systems, often contain lush vegetation and a wealth of animal species.

• 意译：淡水植物和动物：图片画廊。草漂浮物在美国一条河流。河流栖息地，被称湖滨系统，通常含有苍翠繁茂的植物和很多的动物物种。