Our research would not be possible without the support of many.

We are extremely grateful to the governments of Rwanda, Uganda and Kenya - including the Rwanda Development Board, Uganda Wildlife Service, and Kenya Wildlife Service - for permission to work in their national parks, and to our partner institutions, including in Rwanda, the Dian Fossey Gorilla Fund International, Gorilla Doctors, and Institute of National Museums of Rwanda; in Uganda, the Institute of Tropical Forest Conservation, Gorilla Doctors, and Max Plank Institute for Evolutionary Anthropology; and in Kenya, the National Museums of Kenya - Nairobi, Amboseli Baboon Research Project (Duke University, Princeton University, Notre Dame University), Institute for Primate Research, and University of Nairobi. Without the assistance of scientists, field staff, and local communities at these sites and their long-term dedication to supporting gorilla and baboon research and monitoring, this work would not be possible.

We are also grateful for the support of dedicated staff, research and camp assistants in these countries who have con specifically participated specifically in this research since its beginning, including Laurent Ndagijimana, Dominique Mvunabandi, Olive Imanizabayo, Didier Abavandimwe, Thadée Muhire, Nadia Niyonizeye, Jean de Dieu Nsanzineza, Elisabeth Nyirakaragire, Methode Bahizi, and Jean Bosco Noheli; Emmanuel Tibenda, Aventino Nkwasibwe, Vastine Tindimwebwa, Chance Joseph, and Julius Nziza; and Lenkai ole Rikoyan, Moonyoi ole Parsetau, and Lankoi ole Malomet. We also thank the many additional current and former students who have contributed to our field and laboratory-based research over the years; for their longer-term contributions, we particularly thank Amandine Eriksen, Halszka Glowacka, Jason Massey, Kate McGrath, Meagan Vakiener, and Lawrence Fatica. Finally, we are indebted to Keely Arbenz-Smith and, more recently, Marli Richmond for the important roles they have played in managing and assisting our laboratory research at GW.

We have also been fortunate to benefit from the collaboration of numerous colleagues and institutions over the years. In addition to our current collaborators and previous coauthors, we also gratefully acknowledge Dr. Stephen Nawrocki for his invaluable assistance on the Mountain Gorilla Skeletal Project.

Finally, we are very grateful for the external funding support we have received from The Leakey Foundation, National Science Foundation (BCS 0852866, BCS 0964944, BCS 1520221, BCS 1640477, BCS 1753651) National Geographic Society’s Committee for Research and Exploration (8486-08), and The Wenner-Gren Foundation for our research. We also gratefully acknowledge The George Washington University, the 2010 Max Planck Research Award to Dr. Timothy G. Bromage administered by the Max Planck Society and the Alexander von Humboldt Foundation, and Nordenskiöld-samfundet (to Dr. Juho-Antti Junno), for their support at different times over the years.