In December 1997 Wilderness Conservancy donated veterinary supplies and caging to the Gibbon Rehabilitation Project (GRP) on Phuket Island, Thailand. The GRP is a research division of the Wild Animal Rescue Foundation of Thailand (WAR) working in co-operation with the Royal Thai Forest Department (RFD), and is currently the only gibbon rehabilitation project in the world.

The aim of the GRP is to save gibbons and their habitat from destruction. The strategy towards achieving this aim involves three complementary tasks:

To rehabilitate captive Lar gibbons (Hylobates Lar) and release them back into the wild, repopulating forest areas where they have become extinct; Through the education program - encourage local people, tourists and the international community to appreciate, understand and protect gibbons and their rainforest habitat; and Assist in and develop new projects involved in the protection, education, captive breeding, rehabilitation, humane housing and welfare of gibbons.