白天鹅“回家”过冬

Group 1 - The core viewpoint of the article highlights the increase in the population of swans in the Yellow River wetland area of Sanmenxia City, Henan Province, due to enhanced ecological protection efforts [3] - The wetland area along the Yellow River has expanded to over 400,000 acres, attracting more than 10,000 swans for wintering [3] - The article mentions that the swan population has been growing year by year as a result of ongoing ecological conservation initiatives in the region [3]