What does the chital deer do for grey langur monkey?

There's no known direct relationship or interaction where chital deer specifically do anything for grey langur monkeys.

Here's why:

* Different diets and habitats: Chital deer are herbivores, primarily feeding on grass and leaves. Grey langurs are also herbivores, but their diet includes fruits, leaves, and flowers. While they may share some habitat, their foraging preferences are distinct.

* Social structures: Chital deer are social animals, living in herds, while langurs form troops with a complex social hierarchy. These differences in social structure make direct interactions less likely.

* No symbiotic relationship: There's no known instance of a symbiotic relationship (where both species benefit) between chital deer and grey langurs.

It's possible that there might be occasional indirect interactions, like both species utilizing the same water sources or sharing a similar predator. However, these interactions are not specific to either species and don't represent a direct benefit for one over the other.