Disparate social structures are underpinned by distinct social rules across a primate radiation. - Feder JA; Alberts SC; Archie EA; Arlet ME; Baniel A; Beehner JC; Bergman TJ; Carter AJ; Charpentier MJE; Chiou KL; Crockford C; Cowlishaw G; et al. (Proceedings of the National Academy of Sciences of the United States of America, 2026)