•We tested the theory of structural balance (i.e. ‘the enemy of my enemy is my friend’) in rock hyrax social networks.
•We found that in accordance with structural balance, hyraxes tend to form balanced triads.
•Hyraxes changed their social configurations over time, moving into more balanced triads.
•New individuals in the population introduced social instability.
•Triad sex ratio affected the triad type it changed to.
Structural balance in the social networks of a wild mammal
Amiyaal Ilany, Adi Barocas, Lee Koren, Michael Kam, Eli Geffen
Volume 85, Issue 6, June 2013, Pages 1397–1405