Morgan D, Sanz C, Greer D, Rayden T, Maisels F & Williamson EA (2013) Great apes and FSC: Implementing 'ape friendly' practices in Central Africa's logging concessions [Les grands singes et le FSC: Mise en œuvre de pratiques d’exploitation favorables aux grands singes dans les concessions forestières en Afrique centrale]. Occasional Paper of the IUCN Species Survival Commission, 49. Gland, Switzerland: IUCN/SSC Primate Specialist Group. http://www.primate-sg.org/best_practice_logging/
First paragraph: The long-term survival of Africa's great apes has become increasingly uncertain. Dramatic declines in their population numbers have resulted from a combination of factors, including hunting, habitat loss and infectious disease. Although African apes are species of international concern, and despite concerted efforts since the 1980s to create protected area networks, develop conservation action plans and establish policy agreements, their populations continue to decrease. Future projections indicate that this trend will continue unless significant measures to reduce existing threats are taken immediately. The permanent disappearance of any ape species from the wild would be a huge loss to African biodiversity, to the important ecological function they play, and to our shared evolutionary heritage.
Also available at: https://portals.iucn.org/library/node/10378