Pobitora Wildlife Sanctuary lies in Morigaon district of Assam situated on the border of Nagaon and Kamrup Dist. in the northeastern state of India. It is supposed to be the major wildlife stock, situated in a covering area of 38.8 Sq. km. The Pobitora Wildlife Sanctuary is about 50 km from Guwahati. Though, the total notified area of the park is about 38.80 square kilometre but the remaining area is jagged with hillocks. Pobitora was declared a reserve forest in 1971 and a wildlife sanctuary ten years later. Pobitora is mainly famous for its great Indian one horned Rhinoceros. Besides Rhinoceros the other animals are Asiatic Buffalo, Leopard, Wild bear, civet cat etc. Assam’s Pobitora Wildlife Sanctuary is also home to more than 2000 migratory birds and various reptiles. In Pobitora wildlife sanctuary, there are now 81 animals, a ten per cent increase over the last six years. These 81 rhinos are surviving on merely 16 square kilometre area of the park. Pobitora has exceeded its rhino-bearing capacity and is overpopulated. The animals have begun moving outside the sanctuary in search of food, and chances of serious man-animal conflict are quite rife. Besides, the straying animals have the risk of contracting diseases that afflict domestic animals. The wildlife experts, however, regretted that the sanctuary is surrounded by villages on all sides and so there is little scope of expanding the protected area and this makes the animals more vulnerable to poachers than ever before.
The western hoolock gibbon (Hoolock hoolock) is a primate from the gibbon family, Hylobatidae. The species is found in Assam, Mizoram, Bangladesh and in Myanmar west of the Chindwin River.
Hollongapar Gibbon Wildlife sanctuary, more popularly known as Gibbon Wildlife Sanctuary named after Hoolock Gibbon covers an area of 20.98 square kilometers (including the area under Military Engineering Services of Indian Army) at Jorhat district of Assam. The Hoollongapar Gibbon Wildlife Sanctuary was earlier known as Hoollongapar Forest during British period in 1881. This sanctuary is approximately 19 km from Jorhat's town centre and 5 km from Mariani
Assam has been found to be the state with the highest diversity of non-human primate species in India the after a survey team lead by Aaranyak’s primatologist Dr Dilip Chetry has stumbled upon Eastern Hoolock gibbon (Hoolock leucondys) in three reserved forests of Sadiya sub-division in Tinsukia district of the state.
Tucked in a corner of Upper Assam in Bherjan survives a small population of about 35 Western Hoolock Gibbons (Hoolock hoolock). Their lowland evergreen forests have been wiped out and these apes are marooned in an island of tamul or areca nut trees (Areca catechu) and some high canopy trees hemmed in by villages. Fortunately, the villagers are tolerant of these primates and have started protecting these endangered apes and efforts are underway to restore the corridors for their free movement. This fragment broadly falls under the Bherjan – Borajan – Podumoni Wildlife Sanctuary which houses several such small fragments.