Primates is an international journal of primatology whose aim is to provide a forum for the elucidation of all aspects of primates. It publishes original papers that contribute to the development of the scientific study of primates, and its scope embraces work in fields of biological investigation such as morphology, physiology, genetics, psychology, behavior, ecology, sociology, systematics, evolution, and medicine. Original Articles as well as Review Articles, News and Perspectives, and Book Reviews are included. Announcement Our Editor-in-Chief, Professor Toshisada Nishida, passed away in Kyoto on June 7, 2011, at the age of 70. He was a pioneer and leading scientist in primatology and anthropology through his fieldwork with Chimpanzees in the wild. He served in various positions such as the director of the Japan Monkey Centre, the president of the International Primatological Society, the president of the Primate Society of Japan, and the president of the Great Apes Survival Partnership in Japan. In 2008 he received the L.S.B Leakey Foundation Prize for Multidiciplinary Research on Ape and Human Evolution and the Lifetime Achievement Award of the International Primatological Society. He leaves a great legacy in many fields of the academy and in conservation. We do full honor to the memory and achievements of Professor Nishida, and we resolve to continue his work in primatology. Juichi Yamagiwa Editor-in-Chief, Primates