The Zanzibar Forest Project began as a research initiative focusing on the ecology of the Zanzibar red colobus in Unguja, the main Island of Zanzibar. It has since evolved into a broader program that works with the Zanzibar government to design an archipelago-wide protected area system, to implement sustainable development and conserve the island’s increasingly threatened unique natural forests and key species. In 2014/15 WCS carried out the first ever total census of the red colobus population right across its range, and is using the research to inform conservation initiatives inspired by this charismatic flagship species.