1. Preface

   • Osamu Takenaka

   Editorial 11 March 2003 Pages: 75 - 75

2. How fruit abundance affects the chimpanzee party size: a comparison between four study sites

   • Chie Hashimoto
   • Shigeru Suzuki
   • Takeshi Furuichi

   Original Article 18 February 2003 Pages: 77 - 81

   

3. Seasonal variation in association patterns of wild spider monkeys (Ateles belzebuth belzebuth) at La Macarena, Colombia

   • Yukiko Shimooka

   Original Article 19 February 2003 Pages: 83 - 90

   

4. Mother–infant relationships and maternal estrogen metabolites changes in macaques (Macaca fuscata, M. mulatta)

   • Massimo Bardi
   • Keiko Shimizu
   • Silvana M. Borgognini-Tarli

   Original Article 18 February 2003 Pages: 91 - 98

   

5. Long-term study of the social dynamics of patas monkeys (Erythrocebus patas): group male supplanting and changes to the multi-male situation

   • Hideyuki Ohsawa

   Original Article 26 February 2003 Pages: 99 - 107

   

6. Birth-season variation in Japanese macaques, Macaca fuscata

   • Jack Fooden
   • Mitsuru Aimi

   Original Article 20 February 2003 Pages: 109 - 117

   

7. Life history of male Japanese macaques living on Koshima Islet

   • Akio Mori
   • Kunio Watanabe

   Original Article 19 February 2003 Pages: 119 - 126

   

8. Scaling of lumbar vertebrae in anthropoids and implications for evolution of the hominoid axial skeleton

   • Masato Nakatsukasa
   • Youichi Hirose

   Original Article 19 February 2003 Pages: 127 - 135

   

9. Endocranial cast and morphology of the olfactory bulb of Amphipithecus mogaungensis (latest middle Eocene of Myanmar)

   • Masanaru Takai
   • Nobuo Shigehara
   • Takehisa Tsubamoto

   Original Article 14 February 2003 Pages: 137 - 144

   

10. Extraordinarily low bone mineral density in an old female chimpanzee (Pan troglodytes schweinfurthii) from the Mahale Mountains National Park

    • Harumoto Gunji
    • Kazuhiko Hosaka
    • Toshisada Nishida

    Original Article 14 February 2003 Pages: 145 - 149

    

11. Bone mineral density in chimpanzees, humans, and Japanese macaques

    • Yasuhiro Kikuchi
    • Toshifumi Udono
    • Yuzuru Hamada

    Original Article 13 February 2003 Pages: 151 - 155

    

12. Visual preference by chimpanzees (Pan troglodytes) for photos of primates measured by a free choice-order task: implication for influence of social experience

    • Masayuki Tanaka

    Original Article 22 February 2003 Pages: 157 - 165

    

13. Levels of serum brain-derived neurotrophic factor in primates

    • Takuma Mori
    • Keiko Shimizu
    • Motoharu Hayashi

    Original Article 19 February 2003 Pages: 167 - 169

    

14. Behavioral evidence of color vision deficiency in a protanomalia chimpanzee (Pan troglodytes)

    • Atsuko Saito
    • Akichika Mikami
    • Yuusuke Mori

    Original Article 27 February 2003 Pages: 171 - 176

    

15. Perception of shape-from-motion in macaque monkeys and humans

    • Shumpei Unno
    • Reiko Kuno
    • Akichika Mikami

    Original Article 19 February 2003 Pages: 177 - 182

    

16. Comparative study of urinary reproductive hormones in great apes

    • Keiko Shimizu
    • Toshifumi Udono
    • Osamu Takenaka

    Original Article 14 February 2003 Pages: 183 - 190

    

17. A model of the biogeographical journey from Proto-pan to Pan paniscus

    • Jo A. Myers Thompson

    Review Article 18 February 2003 Pages: 191 - 197

    

18. A case report of a novel type of stick use by wild chimpanzees

    • Takeshi Nishimura
    • Naobi Okayasu
    • Juichi Yamagiwa

    Short Communication 13 February 2003 Pages: 199 - 201