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Our research aims to investigate the construction of nature as a world heritage, in particular regarding the orangutan of Indonesia, and explains its concrete implications. A coherent set of elements argue for the conservation of orangutans: their habitat concentration on land unsuitable for agriculture, ingrained local beliefs and the existence of protected areas. However, international scientists closely linked to the conservation movement work at establishing the orangutan as a natural heritage. They developed complex models to this end based on the construction of indicators (numbers, trends, distribution, scarcity) that uphold a perception of scarcity and imminent extinction. They also consolidate their hegemony over the production of knowledge, thus marginalizing the Indonesian actors in the process, and omit fundamental decline factors. As a consequence, the patrimonialization approach makes the management of coexistence between humans and the orangutan impossible. This research suggests that constructing the great apes as a world legacy has problematic concrete implications: imposition of technocratic knowledge, dispossession of the local actors, omission of factors underlying destruction, and ultimately, impossibility of finding solutions for a practical livable coexistence between humans and the great apes.