The Gray langur or Hanuman langur (Semnopithecus) is a genus of colobine monkey. 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 white fur and black faces. They are considered sacred animals therefore the "National social mammal of India".