GorillaFACS: The Facial Action Coding System for the Gorilla spp. - Catia Correia-Caeiro; Raquel Costa; Misato Hayashi; Anne Burrows; Jordan Pater; Takako Miyabe-Nishiwaki; Jack L. Richardson; Martha M. Robbins; Bridget Waller; Katja Liebal (PLoS ONE, 2025)