Group 1 - The core viewpoint of the articles highlights the successful breeding of endangered milu deer in the Ningxia Qingtongxia wetland nature reserve, marking a significant breakthrough in the conservation efforts for this species [1][3] - A total of 35 milu deer were relocated from Jiangsu Dafeng National Nature Reserve to the Qingtongxia area in September 2024, with a dedicated area of over 200 acres established to help them adapt to the northwest climate [3][5] - The Qingtongxia wetland nature reserve covers an area of 174.93 square kilometers, making it the largest Yellow River floodplain wetland in Ningxia and the second-largest bird habitat in Northwest China [5] Group 2 - The ecological restoration efforts in the Qingtongxia wetland began in 2002, with significant investments and actions taken to recover over 50,000 acres of wetland, including the removal of illegal constructions and the restoration of water systems [5][7] - Since 2017, over 40 million yuan has been invested in various ecological restoration projects, resulting in the planting of over 100,000 trees and the return of 120,500 acres of land to wetland [5][7] - The introduction of milu deer has created a mutually beneficial relationship with the wetland ecosystem, as they help control reed growth and enhance soil fertility through their waste [7]