Online First

<Note>
A Short-Term Visit of an Adult Male Bonobo from the Neighboring Unit-group at Wamba
Kazuya Toda, Nahoko Tokuyama, Shintaro Ishizuka, & Takeshi Furuichi

<Note>
Leopards Attempted to Hunt Wild Chimpanzees at Mahale
Hitonaru Nishie

<Note>
Use of Wild Date Palm (Phoenix reclinata) by Mahale Chimpanzees: A Likely Case of Social Learning via Direct Observation
Masaki Shimada

<Forum>
Why Don’t Chimpanzees Use Stones as Lethal Weapons?: A Murder Mystery
William C. McGrew

<From the Field Site>
40 years of research at the Taï Chimpanzee Project
Roman M. Wittig

<Erratum>
Four Cases of Grooming Sessions between Chimpanzees and Guenons at the Kalinzu Forest Reserve, Uganda
Takumi Tsutaya, Natsumi Aruga, Hodaka Matsuo, & Chie Hashimoto