Uniting against a common enemy: Perceived outgroup threat elicits ingroup cohesion in chimpanzees Brooks, James ; Onishi, Ena ; Clark, Isabelle R. ; Bohn, Manuel ; Yamamoto, Shinya Abstract Publication: PLoS ONE Pub Date: February 2021 DOI: 10.1371/journal.pone.0246869 Bibcode: 2021PLoSO..1646869B