Faecal analysis as a method of describing diets of apes : examples from sympatric gorillas and chimpanzees at Lopé, Gabon / Caroline E. G. Tutin and Michel Fernandez -- Methods used in the evaluation of lowland gorilla habitat in the Lopé Reserve, Gabon / Elizabeth A. Williamson -- Field methodology for analyzing diets of eastern lowland gorillas in Kahuzi-Biega National Park, Zaire / Juichi Yamagiwa ... [et al.] -- Approaches in density estimates and reconstruction of social groups of a western lowland gorilla population in the Ndoki Forest, Northern Congo / Masazumi Mitami ... [et al.] -- Measuring chimpanzee food abundance / Richard K. Malenky ... [et al.] -- Nesting behavior of lowland gorillas in the Dzanga-Sangha Reserve, Central African Republic : implications for population estimates and understandings of group dynamics / Melissa J. Remiz