The Siem Pang Wildlife Sanctuary in Cambodia harbours an abundance of wildlife, including five critically endangered bird species. Yet this irreplaceable natural treasure is under threat. Many of Siem Pang’s native species, including elephants, tigers and large herds of wild cattle, have already disappeared from the ecosystem due to poaching and other harmful human activities. Their absence has altered the landscape, with negative impacts for the animals that remain. For instance, without large mammals grazing and creating forest clearings, many seasonal waterholes and wet meadows are gradually becoming overgrown and inaccessible, putting both wildlife and local people at risk.