We studied the ranging patterns of three troops of Hanuman langur (Semnopithecus entellus) in Kumbhalgarh Wildlife Sanctuary, 200 km south of Jodhpur, in the western Aravalli Hills of Rajasthan, India. The home ranges were 106, 45, and 70 ha. This study suggests that the availability of preferred foods, including farm crops and provisioned food, determine the day range of langurs. Comparison of the day ranges of these troops suggests that langurs will raid crops whenever the opportunity is available. They also readily accept foods supplied by humans. Their exploitation of these foods reduces day lengths and range size compared with troops living in forested areas.