Their ecology is unique and biologists are busy cataloguing one of the world's last great storehouses of genetic diversity. But it is a race against time. For the past 1500 years ago humans have slashed and burned their way across the island. At the current rate all of Madagascar's forests will be gone in 30 years. But a unique partnership between a traditional healer and a biologist looks set to succeed where other more traditional approaches to conservation have failed. Biologist Dr Nat Quansah and healer Ndrunulla are teaching people to value the forest's traditional herbal cures. Their health clinic uses natural drugs of the 'pharmacy in the forest'