Extractive foraging (EF) involves the exploitation of hidden or embedded foods,generally any food that is not visible to the naked eye.Therefore,EF is particularly important for survival in marginal habitats as provides seasonal fallback foods in low food availability season.In spite of many studies involve primates EF behavior and category,colobine species usually are categorized as non-extractive foragers as few studies quantitatively involve their EF behavior.In this study,we examined the EF behavior of one colobine species,gray snub-nosed monkeys (Rhinopithecus brelichi),at Yangaoping in Fanjingshan National Nature Reserve,Guizhou.We recorded six categories of EF behaviors.The most frequently sought-out foods included seeds,young bamboo and invertebrates.Extracted foods accounted for an average of 26.02% of feeding records.There is a positive relationship between EF behavior frequency and the abundance of mature leaves; but there is a negative correlation between foraging behavior frequency and deciduous young leaf consumption.According to these findings,we suggest R.brelich should be considered as an extractive forager.Our study also highlights the need for increased representation of colobines in the EF literature to better inform the discussion concerning its link to primate brain evolution.