Gray langurs or Hanuman langurs, the most widespread langurs of South Asia, are a group of Old World monkeys constituting the entirety of the genus Semnopithecus. All taxa have traditionally been placed in the single species Semnopithecus entellus. In 2001, it was recommended that several distinctive former subspecies should be given full species status, so that seven species are recognized. A taxonomic classification with fewer species has also been proposed. Genetic evidence suggests that the Nilgiri langur and purple-faced langur, which usually are placed in the genus Trachypithecus, actually belong in Semnopithecus.

Gray langurs are large and fairly terrestrial, inhabiting forest, open lightly wooded habitats, and urban areas on the Indian subcontinent. Most species are found at low to moderate altitudes, but the Nepal gray langur and Kashmir gray langur occur up to 4,000 metres (13,000 ft) in the Himalayas.

"Hanuman" refers to the Hindu deity Hanuman.

The Sariska Tiger Reserve is an Indian national park located in the Alwar district of the state of Rajasthan. The topography of Sariska supports scrub-thorn arid forests, dry deciduous forests, rocks and grasses. This area was a hunting preserve of the erstwhile Alwar state and it was declared a wildlife reserve in 1955. In 1978, it was given the status of a tiger reserve making it a part of India's Project Tiger scheme. The present area of the park is 866 km². The park is situated 107 km from Jaipur and 200 km from Delhi.

Source - Wikipedia

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