tarai gray langur or semnopithecus hector sitting high on tree during winter season safari at pilibhit national park forest tiger

langur india tarai gray terai semnopithecus hector pilibhit bardiya national park nepal tiger reserve dudhwa corbett subspecies northern plains jungle forest tree nature natural wild wildlife animal mammal black face expression behavior travel destination common langurs monkey sacred family habitat primate species hanuman indian threatened outdoor old world monkeys safari