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Trachypithecus spp were described as picky eaters,concentrating diet on a few preferred food species/items.From January to December 2005,I quantified potential food availability and the food consumed by five groups of Franqois langur (T.francoisi) in the Mayanghe Nature Reserve (MNR,28°37′30"~54′20″N),aiming to test whether their food consumption in proportion to food availability in that seasonal and disturbed habitat.