toshisada nishida (march 3, 1941 – june 7, 2011) was a japanese primatologist who established one of the first long term chimpanzee field research sites, in 1965, and was the first to discover that, instead of forming nuclear family-like arrangements, chimpanzees live a communal life with territorial boundaries. he also laid the basis for the new field of zoopharmacognosy on discovering the potentially medicinal use of plants by wild chimpanzees. he was full professor in the zoology department of kyoto university. toshisada nishida received the leakey prize for his accomplishments in human evolutionary science.