Guayasamin, O.; Couzin, I. D.; Miller, N. Y.: Behavioural plasticity across social contexts is regulated by the directionality of inter-individual differences. Behavioural Processes 141 (2), pp. 196 - 204 (2017)
Scientists studying a rare population of tool-using chimpanzees have found that aging can have a profound impact on their abilities—but not all chimps decline equally.