Feeding ecology of western lowland gorillas in the Nouabalé-Ndoki National Park, Congo Tomoaki Nishihara OriginalPaper Pages: 151 - 168
Do the old aged females experience a long post-reproductive life span?: The cases of Japanese macaques and chimpanzees Yukio TakahataNaoki KoyamaShigeru Suzuki OriginalPaper Pages: 169 - 180
Tool-use by chimpanzees (Pan t. troglodytes) in the Lopé Reserve, Gabon Caroline E. G. TutinRebecca HamDorothea Wrogemann OriginalPaper Pages: 181 - 192
Tool-use for catching ants by chimpanzees at Bossou and Monts Nimba, West Africa Yukimaru Sugiyama OriginalPaper Pages: 193 - 205
A within-group gang attack on a young adult male chimpanzee: Ostracism of an ill-mannered member? Toshisada NishidaKazuhiko HosakaMiya Hamai OriginalPaper Pages: 207 - 211
Play behaviour and its effects on social development of common chimpanzees (Pan troglodytes) Nicola MarkusDavid B. Croft OriginalPaper Pages: 213 - 225
Culturally-transmitted feeding behaviour in primates: Evidence for accelerating learning rates Louis Lefebvre OriginalPaper Pages: 227 - 239
Birth seasonality in cotton-top tamarins (saguinus oedipus) despite constant food supply and body weight William C. McGrewJoanne Webster OriginalPaper Pages: 241 - 248
Serum levels of prolactin during the ovarian cycle, pregnancy, and lactation in the common marmoset (Callithrix jacchus) Makoto MoroRyuzo ToriiYoshikuni Tanioka OriginalPaper Pages: 249 - 257
Urine washing and related behaviour in wild moustached tamarins,Saguinus mystax (callitrichidae) Eckhard W. Heymann Short Communication Pages: 259 - 264
Factors determining tool-using ability in two captive chimpanzee (Pan troglodytes) colonies Linda BrentMollie A. BloomsmithStanley D. Fisher Short Communication Pages: 265 - 274
Hand preference in the Sifaka (propithecus verreauxi coquereli) during feeding in captivity Angela M. MasonLinda D. WolfeJeffery C. Johnson Short Communication Pages: 275 - 280
Sharing of sleeping sites betweenAotus vociferans with other mammals in the Peruvian Amazon Pablo E. PuertasRolando AquinoFilomeno Encarnacion Research Report Pages: 281 - 287
Observations onChiropotes albinasus from the Rio dos Marmelos, Amazonas, Brazil Stephen F. Ferrari Research Report Pages: 289 - 293