The Cao Vit gibbon is the 2nd rarest ape species in world, with an estimated population of around 130 animals living in one patch of forest on the China-Vietnam border. Habitat destruction for fuelwood collection and livestock grazing has driven this species to the brink of extinction.
Fauna and Flora rediscovered the species in 2002 and have since worked towards preserving them. Through promotion of alternative fuel sources and education about livestock grazing they hope to reduce the rate of deforestation. Twycross Zoo funds a 6-man community based patrol that continually monitors the forests for gibbons. During the most recent survey in 2012 the population had grown by 17% since 2007 so the actions of the project are proving to be successful.