Munich Alp R Stepping-sticks and seat-sticks: new types of tools used by wild chimpanzees in Sierra Leone. Am J Primatol 41:4552 Arcadi AC, Daniel R, Boesch C Buttress drumming by wild chimpanzees: temporal patterning, phrase integration into loud calls, and preliminary evidence for individual distinctiveness. Primates 39:505518 Arcadi AC, Wrangham RW Infanticide in chimpanzees: review of cases and a new withingroup observation from the Kanyawara study group in Kibale National Park. Primates 40: 337351 Assersohn C, Whiten A, Tiwede AT, Tinka J, Karamagi J Use of leaves to inspect ectoparasites in wild chimpanzees: a third cultural variant? Primates 45:255258 Azuma S, Toyoshima A Progress report of the survey of chimpanzees in their natural habitat, Kabogo Point Area, Tanganyika. Primates 3: 170 Basabose AK, Yamagiwa J Factors affecting nesting