<P> Like the other gibbons, they are diurnal and arboreal, brachiating through the trees with their long arms . They live together in monogamous pairs, which stake out a territory . Their calls serve to locate family members and ward off other gibbons from their territory . Their diet consists mainly of fruits, insects and leaves . </P> <P> Young hoolocks are born after a seven - month gestation, with milky white or buff - colored hair . After about six months, the hair of males will darken and turn black, while the female hair remains buff - colored throughout her life . After eight to 9 years, they are fully mature and their fur reaches its final coloration . Their life expectancy in the wild is about 25 years . </P> <P> The classification of this gibbon has changed several times in the past few years . Classically, all gibbons were classified in the genus Hylobates, with the exception of the siamang . After some studies, the genus was divided into three subgenera (including the siamang's Symphalangus), and then into four (recognizing Bunopithecus as the hoolock subgenus distinct from other gibbon subgenera). These four subgenera were elevated to full genus status . However, the type species for Bunopithecus is Bunopithecus sericus, an extinct gibbon or gibbon - like ape from Sichuan, China . Very recent investigations have shown the hoolocks are not closely related to B. sericus, so have been placed in their own genus, Hoolock . In the process, the two subspecies of hoolocks have been raised to species level . A new subspecies has been described recently from northeastern India, which has been named Mishmi Hills hoolock, Hoolock hoolock mishmiensis . A further new species, Hoolock tianxing, with an estimated population of about 200 in China, was discovered in southwest China in 2017 . </P> <P> The species of hoolock are: </P>

Hoolok gibbon is the only spices of which animal found in india
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