Background & Aims: Ex-situ conservation is an important part of the Convention on Biological Diversity, one of the objectives of the "Aichi Biodiversity Targets" and a strategic task and priority action of the China Biodiversity Conservation Strategy and Action Plan (2011-2030). Milu (Père David's deer) (Elaphurus davidianus) is listed as Class I National Key Protected Species of China. Before the wild population of Milu deer became extinct in China, captive populations were established overseas, which formed the basis for a reintroduction to China in 1985. Since reintroduction, the native population has become established and has expanded. The starting point for the reintroduction process was Beijing Milu Park, where 38 deer were reintroduced in 1985. After successful expansion of the population,
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