Time budget of daily activity of Francois‘ Langur (Trachypithecus francoisi francoisi) in disturbed habitat Diet and the seasonal changes of the Franois’ langur (Trachypithecus francoisi) Habitat Selection by Francois‘ Langur in Jinfo Mountain in Spring The crude protein content of main food plants of François’ langur (Trachypithecus francoisi) in Fusui, Guangxi, China