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Oxytocin enhances social affiliation in chimpanzee groups. Dec. 27, 2016
http://m.phys.org/news/2016-12-oxytocin-social-affiliation-chimpanzee-groups.html
Liran Samuni, Anna Preis, et al. Oxytocin reactivity during intergroup conflict in wild chimpanzees. Dec. 27, 2016 doi: 10.1073/pnas.1616812114 Jan. 10, 2017 vol. 114 no. 2 268-273