Greater One-horned Rhinoceros Rhinoceros unicornis (Mammalia: Perissodactyla: Rhinocerotidae) population census in the Rajiv Gandhi Orang National Park, Assam, India

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Deba Kumar Dutta
Parikshit Kakati


The complete-count of rhino or rhino census is an integral part of conservation and management of wild rhino-bearing areas of Assam.  The direct count of rhinos in their wild habitat continues as the accepted method of determining rhino population.  As a part of the periodic process, the Rajiv Gandhi Orang National Park (RGONP) organized a one-day direct rhino count on 2 April 2018.  The results showed 1% increment of the population after a gap of six years.  Such slow increment is considered to be a matter of concern.  More research is necessary for better understanding of the population dynamics and identification of factors for better management of rhino population at RGONP. 

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Author Biographies

Deba Kumar Dutta, WWF‐India, Block-A-16, Flat No-103 Basistha, Guwahati, Assam 781029, India

Dr Deba Kumar Dutta has been providing technical support on rhino monitoring and research activities to translocated rhinos at Assam since the year 2008. He is an IUCN/SSC AsRSG member and also an IUCN/SSC AsRSG (Asian Rhino Specialist Group) accredited instructor in monitoring the Greater One-Horned Rhino.   

Parikshit Kakati, WWF‐India, Block-A-16, Flat No-103 Basistha, Guwahati, Assam 781029, India.

Dr Parikshit Kakati has been providing veterinary support and other research activities in Assam since the year 2017.


Barua, M. (1998). Pobitora Wildlife Sanctuary. Zoo’s Print 13(4): 9–1.

Bhatta, R. (2011). Ecology and Conservation of Great Indian One Horned Rhino Rhinoceros unicornis in Pobitora Wildlife Sanctuary, Assam, India, PhD Thesis, Gauhati University, 227pp.

Borthakur, U., P. Das, A. Talukdar & B. Talukdar (2016). Non-invasive genetic census of Greater one horned rhinoceros (Rhinoceros unicornis) in Gorumara National Park, India: a pilot study for population estimation. Oryx 50(3): 489–494.

Daniel, J.C. (1967). The Point Calemere Sanctuary, Madras State. Journal of the Bombay Natural Histroy Society 64(3): 512–523.

Debroy, S. (1986). Fire in tall grassland habitats of Assam. The Indian Forester 112(10): 414–418.

DNPWC (2009). The Status and Distribution of the Greater One Horned Rhino in Nepal. Department of National Parks and Wildlife Conservation, Kathmandu, Nepal, XV+72pp.

Davider, E.R.C. (1978). Distribution and status of the Nilgiri Tahr Hemitragus hylocrius 1975–78. Journal of the Bombay Natural Histroy Society 75(3): 815–844.

Dutta, D.K., A. Sharma, R. Mahanta & A. Swargowari (2017). Behaviour of post released translocated Greater One Horned Rhinoceros Rhinoceros unicornis at Manas National Park, Assam, India. Pachyderm (58): 58–66.

Gopal, R. (2012). Fundamentals of Wildlife Management. Nataraj Publisher, New Delhi, 1288pp.

Assam Forest Department (2014). White Paper on Wildlife Conservation in Assam, Department of Environment and Forests, Government of Assam, 109pp.

Hazarika, B.C. (2007). Studies on the Eco-Behavioural Aspects of Great Indian One-Horned Rhino (Rhinoceros unicornis Lin) in Orang National Park, India. PhD Thesis, Gauhati University, 270pp.

IUCN AsRSG (2009). The Greater One Horned Rhinoceros Monitoring Instructos Training Manual. International Union for Nature Conservation and Asian Rhino Sepcialist Group, 108pp.

Lahan, P. & S.N. Sonowal (1973). Kaziranga Wildlife Sanctuary, Assam, Journal of Journal of the Bombay Natural Histroy Society 70(2): 245–278.

Lahkar, P.B., K.B. Talukdar & P. Sarma (2011). Invasive species in grassland habitat and ecological threat to Greater One Horned Rhino (Rhinoceros unicornis). Pachyderm 49: 33–39.

Laurie, W.A. (1978). The Ecology and Behaviour of the Greater One-Horned Rhinoceros. PhD Dissertation, Cambridge University, Cambridge, UK, 486pp.

Mukherjee, S. & S. Sengupta (1999). Census of Great Indian One Horned Rhinoceros at Jaldapara Wildife Sanctuary, Cooch Behar Forest Division, West Bengal, India. Tiger Paper 26(4): 18–21.

Nair, P.V. & M. Gadgil (1980). The status and distribution of elephant populations of Karnataka. Journal of the Bombay Natural Histroy Society 75(suppl.): 1000–1016.

Nair, S.S. (1976). A population survey and observation on the behaviour of the blackbuck in the Point Calemere Sanctuary Tamilnadu. Journal of the Bombay Natural Histroy Society 73(2): 304–310.

Overton, W.S. (1971) Estimating the numbers of animals in wildlife populations, pp3–7. In: Giles, R.H. (Ed.) Wildlife Management Techniques, 3rd Edition. The Wildlife Society, Washington D.C., 633pp.

Patton, F.J. (2007). The use of Individual identification in conservation management of Black Rhinoceros (Diceros bicornis). PhD Thesis. Manchester Metropolitan University, UK, 218pp.

Sarma, K.P., S.B. Mipun, K.B. Talukdar, H. Singh, K.A. Basumatary, K.A. Das, A. Sarkar & B.C. Hazarika (2012). Assessment of Habitat Utilization pattern of rhinos (Rhinoceros unicornis) in Orang National Park, Assam, India. Pachyderm 51: 38–44.

Schaller, G.B. (1967). The Deer and the Tiger-A Study of Wildlife in India. The University of Chicago Press, Chicago & London, 384pp.

Singh, V.B. (1978). The elephant in U.P. (India): a resurvey of its status after 10 years. Journal of the Bombay Natural Histroy Society 75(1): 71–82.

Subedi, N., S. Jnawali, M. Dhakal, N. Pradhan, B. Lamichhane, S. Malla & Y. Jhala (2013). Population status, structure and distribution of the Greater one-horned Rhinoceros, Rhinoceros unicornis in Nepal. Oryx 47(3): 352–360.