During his research for the Assamese monkeys along the Sankhuwa and Khoglewa river in 1997 and 1998, he observed a different variety of monkeys that are not similar with Macaca assamensis species. He is currently studying the assamese monkey in Assam, India. He also confirmed by the outer structure and body size that the Nepali monkeys of Tamku sector is is not similar to the Assamese monkeys of Assam. He suggested that it might be from the different branch of macaques groups. Head and body length are more than 2 ft long with tail length of 14 inches.
Facial coloration is different in males and females.
Pelage is tanned blackish-ashy to blond in both sexes. He censused more than 80 monkeys in this area are still surviving in five different troops. Due to the human pressure and lack of proper conservation and management planning of the area, they are facing problems. Habitat loss resulted raiding of crop-fields, specially corn fields of marginal areas. They are frequently harassed by the local villagers making fire in night halt site of monkeys.