The Tufted Gray Langur is listed as “Near Threatened” by the IUCN Red List.
Found usually in the dry zone, these langurs featured here were seen in the sacred city of Anuradhapura. They are also a common sight in Dambulla, Sigiriya and Pollonnaruwa, Tissamaharama and the Yala National Park.
They are also known to spend time near water bodies. A usually shy animal, Langurs stick to their territories and a single pack could mean up to 20 to 50 animals. While the large pack is led by a male and female combination, smaller groups are led by an Alpha male.
The Tufted Gray Langurs are known to communicate through different sounds- barks, grants, whoops and howls. They are said to spend time close to spotted deer, so they could be warned of any danger, the Langurs could see from atop trees. In turn the super sense of smell that spotted deer have, give them the ability to sense and warn the Langurs of a possible threat.
(Information taken from Wikepedia)