The Gray langur or Hanuman langur (Semnopithecus) is a genus of colobinemonkey. They are found in southeast Asia. The word "langur" means 'having a long tail'. It is commonly called the leaf monkey. They usually live in small groups of between 2 and 10 individuals. They mainly eat leaves, as well as some fruit. Langur spend most of their time in trees. They have whitefur and blackfaces. They are considered sacred animals therefore the "National social mammal of India".
↑Vivek Menon; et al. (2003). Indian Mammals. Dorling Kindersley. ISBN9780143029984.from the entry on Hanuman Langur, p.37: "There are several races of Hanuman langur, differing in colour and size. Scientists are currently debating whether this langur is a single species with several sub-species, or whether these are different species."