Greater One-Horned Rhino Population Tops 4,000 for the First Time Records Began

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In their biannual population survey, the International Rhino Foundation (IRF) has announced that the population of the greater one-horned rhinoceros has passed 4,000 individuals for the first time since record-keeping began.

Also known as the Indian rhino, the greater one-horned rhinoceros (Rhinoceros unicornis) numbered less than 200 in 1910, but through a poaching ban, the establishment and expansion of protected areas, and captive breeding programs, the Indian rhino has made a super comeback.

Currently, 70% of these rhinos are found in the Indian state of Assam, which completed a population survey in March, and when combined with the survey from neighboring Nepal, the IRF found 274 rhinos had been born since the last count – helped by a ‘baby boom’ during the pandemic when many protected areas were closed to visitors.

“For a species that was once perilously close to extinction, numbering fewer than 100 individuals, this recovery is truly remarkable,” said Nina Fascione, executive director of the IRF.

Now found only in India and Nepal, the Indian rhino once roamed in Bhutan, Pakistan, Bangladesh, and into Myanmar, and even southern China.

PICTURED: An adult male one-horned rhino takes shelter on high land during flood at Kaziranga National Park in Bagori range of Nagaon district of Assam. PC: Diganta Talukdar. CC 4.0.

The State of the Rhino

The second-largest rhino species behind the white rhinoceros, the Indian rhino is characteristically distinct for its single horn, and warty, overfolded skin on the hind quarters. Assam’s 70% of the population are found essentially all within one area, Kaziranga National Park. A UNESCO World Heritage Site, Kaziranga is just 331 square miles, one-tenth the size of Yellowstone.

Because of this, expansion of the Indian rhino population is still a priority, for if something like a devastating wildfire, or disease occurred within the park, suddenly almost three-fourths of the world’s population would be at risk.

To combat this, earlier this year plans were announced to increase Orang National Park — also in Assam, which holds around 125 rhinos, by about 120 square miles. With NGO partners, including IRF, the government of Assam also began translocation of rhinos within Kaziranga to give rhinos maximum room to breed.

In Nepal, Chitwan National Park recorded 694 individuals last year in an area around the same size and importance as Kaziranga. A larger park, Bardiya NP, underwent a translocation project in 1986, which originally saw success, but throughout the 2000s the park experienced precipitous declines in the rhino population from around 67 to 22. The declines are believed to be due to poaching, something difficult to track and stop as Bardiya is among the most remote and least-accessible protected areas in Nepal.

Other reserves and parks in India and Nepal that have rhino populations are small, and the expansion of the species has reached somewhat of a glass ceiling. However as the only Asian rhinoceros species that can be found in any substantial numbers, additional opportunities exist to restore populations of rhinos in Vietnam, a country that had its own subspecies, or various islands of Indonesia and Malaysia, which also used to be populated with rhino.

The Indian rhino is closely related to the Javan rhino, which could be the most-critically-endangered large mammal on Earth, and exists as 74 individuals in the northern tip of the island of Java, Indonesia. Again, the Indian rhino could help this population survive by introducing additional genetics if inbreeding becomes a threat, which it already is, as well as by acting as surrogates if necessary. WaL

 

PICTURED ABOVE: A greater one-horned rhino and her calf in Chitiwan National Park, Nepal. PC: Sushan116. CC 4.0.

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