A population of at least 500 grey-shanked doucs has been uncovered by Fauna & Flora International (FFI) during a recent field survey in Kon Tum, Vietnam. This almost doubles the known global population of one of the 25 most endangered primates in the world. Restricted to the forests of central Vietnam, the main threats to the grey-shanked douc are deforestation, habitat fragmentation and hunting.

Photograph: Nguyen Van Truong/FFI