A new study, conducted on wild chimpanzees (Pan troglodytes verus) in Taï National Park, Côte d'Ivoire, provides evidence that the gestures used by male chimpanzees from four neighboring communities during copulation requests may reflect different dialects. One gesture, used predominantly in one community, disappeared from the repertoire 20 years ago after a poaching incident and did not return. This incident documents a cultural loss associated with human-induced population decline, a phenomenon rarely documented in animals.