According to a study published in Journal of Threatened Taxa, differing elevations of habitation make one group of Himalayan Gray Langur prefer fruits and another group relish flowers.
- The Himalayan Gray Langur or the Chamba Sacred Langur (Semnopithecus ajax) is a colobine, meaning leaf-eating monkey.
- It is considered an endangered species globally as its population is estimated to be less than 1,500 mature individuals in 15-20 groups.
- They inhabit areas between 2,200-4,000 metres above mean sea level in the subtropical, tropical moist temperate, alpine, coniferous and broadleaved forests and scrublands.
- It is endemic to the Jammu and Kashmir and Himachal regions of western Himalayas, where the ecosystem is vulnerable and susceptible to the impact of anthropogenic pressures.
- It is also reported from Pakistan and Nepal.