Core Insights - The discovery of Dugong activities near Yongshu Reef marks a significant ecological event, as it was previously declared functionally extinct in mainland China [1][3] - The presence of Dugongs, along with other endangered species like Hawksbill turtles and Green turtles, highlights the ecological value of the Yongshu Reef area and the success of conservation efforts [5] Group 1: Species Discovery - The first sighting of Dugongs in the waters near Yongshu Reef occurred on July 8, 2025, with continuous observations for nearly a month [3] - The identification of Dugongs was confirmed by marine animal experts from the Chinese Academy of Sciences [3] - This marks the first scientific evidence of living Dugongs in the South China Sea in nearly 30 years, filling a significant gap in species distribution data [3] Group 2: Ecological Significance - The presence of Dugongs indicates the health of seagrass bed ecosystems, which are crucial for maintaining biodiversity [1][5] - The discovery of multiple endangered species in the Yongshu Reef area underscores the unique ecological value of the region and the effectiveness of ecological protection measures [5] - The diverse habitats formed by coral reefs, seagrass beds, and sandy beaches support marine life and demonstrate the ongoing health of the South China Sea ecosystem [5]