Some people have tried using bigger monkeys called langurs. Langurs are enemies of the rhesus monkeys. Shop owners use the langurs like guards. They put them on chains in front of buildings. The langurs scare off the smaller rhesus monkeys. However, this solution has problems. The rhesus monkeys do stay away from the shops with langurs. But they don't leave the city. They just move to another area and cause trouble in a new place. Also, chaining wild animals goes against India's wildlife protection laws. It seems that the idea of using langurs is not a good solution.