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Western hoolock gibbon was created in 1834.
Eastern hoolock gibbon was created in 2005.
Hoolock Gibbon
The Western hoolock gibbon (Hoolock hoolock) is the provincial animal of Mizoram, Republic of India.
well there is nine difrent species and they are concolor gibbon, siamang gibbon, kloss gibbon, lar gibbon, pileated gibbon, hoolock gibbon and more.