 They are folivorous, with about 78% of the diet reportedly consisting of foliage, although they also eat fruit, seeds, and flowers.The monkeys have been reported to eat leaves from a wide range of different plant species, indicating that their apparent dependence on limestone habitats is not related to their diet.In previous decades, Delacour's langurs were reported to live in troops of up to 30 individuals, often including a mix of males and females, although single-male groups are more common, and some small all-male groups have also been reported.