Year: 2014DOI: 10.7717/peerj.417Publication Type: Journal Article - Multi-AuthorJournal Volume: 2:e417Article/Chapter Title: Ape duos and trios: Spontaneous cooperation with free partner choice in chimpanzeesJournal Name: PeerJAuthor(s) from ICR Staff: Timothy Eppley, Ph.D.Author Name/Init: Author Surname: SuchakAuthor Initials: M. Author Surname: EppleyAuthor Initials: T.M. Author Surname: CampbellAuthor Initials: M.W. Author Surname: de WaalAuthor Initials: F.B.M.