The greater one-horned rhinoceros is commonly found only in South Asia and South East Asia. Historically, the rhinos were distributed in the floodplain and forest tracts in Brahmaputra, Ganges and Indus river valley. Today, however, no more than 2,000 remain in the wild, with only two populations containing more than 100 rhinos: Kaziranga National Park in Assam, India (1,200) and Chitwan National Park (CNP), Nepal (600). Despite joint efforts between Bhutan and India, the survival of a small population of rhinos living along the Indo-Bhutan border in Manas still remains doubtful (Jnawali et.at, 2000).
