Group 1 - The core focus of the article is on the relationship between a volunteer, Zhou Yuan, and a family of Yangtze River dolphins, particularly the youngest calf named "Liu Liu," and the hope for the family to grow [1][10]. - Zhou Yuan has been observing the dolphins for three years, with a particular interest in a trio consisting of a mother dolphin and her two calves, which have been frequently spotted in a less crowded area of the river [4][8]. - The dolphins exhibit strong familial behavior, with the mother teaching the calves fishing techniques, which aligns with the species' natural habits [8][10]. Group 2 - Zhou Yuan and fellow volunteers have made over 60 observations of the dolphin family, capturing more than 30 clear videos, indicating a strong commitment to monitoring their well-being [10]. - The name "Liu Liu" was chosen for the youngest calf, symbolizing both the location of their habitat and a wish for the family to remain together [10]. - The volunteers often wait for over two hours to see the dolphins, demonstrating their dedication and emotional connection to the animals [10].