‘Adoption’ by maternal siblings in wild chimpanzees

Cat Hobaiter, Anne Marijke Schel, Kevin Langergraber, Klaus Zuberbuehler

Research output: Contribution to journalArticlepeer-review

Abstract

The adoption of unrelated orphaned infants is something chimpanzees and humans have in common. Providing parental care has fitness implications for both the adopter and orphan, and cases of adoption have thus been cited as evidence for a shared origin of an altruistic behaviour. We provide new data on adoptions in the free-living Sonso chimpanzee community in Uganda, together with an analysis of published data from other long-term field sites. As a default pattern, we find that orphan chimpanzees do not become adopted by adult group members but wherever possible associate with each other, usually as maternal sibling pairs. This occurs even if both partners are still immature, with older individuals effectively becoming ‘child household heads’. Adoption of orphans by unrelated individuals does occur but usually only if no maternal siblings or other relatives are present and only after significant delays. In conclusion, following the loss of their mother, orphaned chimpanzees preferentially associate along pre-existing social bonds, which are typically strongest amongst maternal siblings.
Original languageEnglish
Article numbere103777
Number of pages6
JournalPLoS ONE
Volume9
Issue number8
DOIs
Publication statusPublished - 1 Aug 2014

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