The history of wildlife conservation in Cambodia in the twentieth century reveals the tensions that existed between the Khmer kingdom and international nature conservation networks, colonial or global. Wildlife conservation in Cambodia was not a priority for the French colonial administration. It only regulated hunting. While the global conservation movement was expanding via international conferences, local French administrators managed to obstruct the implementation of a conservation policy. After the Second World War, Western scientists and activists sought to establish reserves, particularly to protect a new species of wild cattle, the kouprey. The International Union for the Conservation of Nature (IUCN), through the notable efforts of Harold Coolidge, succeeded in convincing Prince Sihanouk to adopt such a policy in the 1960s. However, although 12 per cent of the kingdom's land was protected, funding and means for conservation remained largely inadequate. The war put an end to all conservation programmes. The IUCN renewed its efforts in the 1980s successfully establishing a network of protected areas in Cambodia in 1993. The various twentieth-century Cambodian wildlife conservation policies, which all imposed external models, often without prior adequate field studies or involvement of local populations, have failed to prevent emblematic species from disappearing.