Deforestation is the greatest threat facing Sumatran orangutans, so protecting and restoring their forest habitat is vital to their survival. We support the Sumatran Orangutan Society (SOS) who are working with their Indonesian partners to replant degraded land, such as ex-oil palm plantations. Native tree seedlings are grown in purpose-built nurseries until large enough to be transplanted into the field, a program of in-field care ensures maximum establishment. We are supporting tree-planting in Cinta Raja, a restoration site in the Leuser Ecosystem – the last place on Earth where orangutans, elephants, tigers and rhinos coexist in the wild. This ecosystem is also crucial for 4 million people in Sumatra who rely on it for clean water, flood prevention and livelihoods.