`Adoption' by Maternal Siblings in Wild Chimpanzees Hobaiter, Catherine ; Schel, Anne Marijke ; Langergraber, Kevin ; Zuberbühler, Klaus Abstract Publication: PLoS ONE Pub Date: August 2014 DOI: 10.1371/journal.pone.0103777 Bibcode: 2014PLoSO...9j3777H