Gray langurs or Hanuman langurs, the most widespread langurs of the Indian Subcontinent, 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 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.
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Langour ya kijivu au Langour ya Hanuman, Langour ya India, ni kundi la nyani wa Ulimwengu wa Kale ambao hufanyiza jamii nzima ya Semnopithecus. Jamii zote zimewekwa katika spishi moja ya Semnopithecus entellus. Mwaka 2001 ilipendekezwa kwamba aina kadhaa za zamani za aina ndogo ziwe na hadhi ya aina, ili aina saba zitambuliwe. Uainishaji wa taxonomic na spishi chache pia umependekezwa. Utafiti wa chembe za urithi unaonyesha kwamba languri wa Nilgiri na languri wa uso wa zambarau, ambao kwa kawaida huwekwa katika jamii ya Trachypithecus, kwa kweli ni wa jamii ya Semnopithecus. Languri wa rangi ya kijivu ni wakubwa na wanaishi kwenye nchi kavu, wanaishi katika misitu, maeneo ya wazi yenye miti michache, na maeneo ya mijini katika bara la India. Mimea ya aina hii hupatikana katika maeneo ya chini hadi ya wastani, lakini langur wa Nepal na langur wa Kashmir hupatikana hadi mita 4,000 kwenye milima ya Himalaya. Badala ya kuchunguza tovuti nyingi, vitabu vya mwongozo au chapisho kutoka kwa marafiki wako kwenye mitandao ya kijamii, unastahili likizo isiyo na shida iliyopangwa na mtaalamu, kuokoa wakati wako wa thamani.