Core Viewpoint - The population of the milu deer in Jiangsu Dafeng National Nature Reserve has significantly increased from 39 in 1986 to over 8,500, making it the world's largest gene pool for this species and achieving the highest breeding, survival, and annual growth rates globally [1][2]. Group 1 - The milu deer, also known as "four not alike," is a unique species in China that plays a crucial role in maintaining the safety and integrity of wetland ecosystems [1]. - The successful reintroduction of milu deer is recognized as one of the top 15 successful species reintroduction projects globally, according to the World Conservation Union [1]. - The Dafeng milu deer population has consistently broken records, surpassing 100 in 1992 and 1,000 in 2006, due to sustained efforts from local government and conservation areas [2]. Group 2 - Dafeng, located in the economically developed Yangtze River Delta, faces challenges in preserving the original ecological environment for milu deer amidst development pressures [4]. - Increased investment in ecological protection by various levels of government has accelerated the recovery of the milu deer population, becoming a consensus among the public [4]. - The expansion of the milu deer population has led to environmental overload and some vegetation degradation, prompting the reserve to initiate translocation experiments to promote biodiversity [4].