Gharial & Crocodiles of Nepal: Gharial vs Mugger, Breeding Centre & Status

Nepal is home to just two species of crocodilian, both confined to the warm lowland rivers, lakes and wetlands of the Tarai. The first is the gharial (Gavialis gangeticus), an unmistakable, slender-snouted fish-eater that is one of the most endangered large animals in South Asia. The second is the mugger or marsh crocodile (Crocodylus palustris), a stockier, broad-snouted generalist that is more widespread and more adaptable. In Nepali the general word for crocodile is 'gohi' (गोही), the gharial is often called 'ghadiyal' (घडियाल), and the mugger is sometimes called 'magar gohi'.

The two animals share the same river systems but occupy different niches, which lets them coexist. The gharial is a specialist of deep, fast-flowing river channels with clean water and sandy banks, where it hunts fish. The mugger is far more flexible, thriving in rivers, oxbow lakes, marshes, reservoirs and even village ponds, and taking a much wider range of prey. Understanding the difference between the two is the single most common reason people search for 'gharial vs crocodile' or 'crocodile in Nepal'.

Both species matter for tourism and general knowledge: they are among the flagship reptiles of Chitwan and Bardiya national parks, and the gharial in particular is a conservation icon. Because the gharial is Critically Endangered and legally protected, its recovery has become one of Nepal's best-known captive-breeding stories.

The easiest way to distinguish a gharial from a mugger is the snout. The gharial has an extremely long, narrow, almost tube-like snout lined with many small, sharp, interlocking teeth (roughly 27-29 upper and 25-26 lower on each side, well over 100 in total). This shape is perfectly designed to sweep sideways through the water and snap up fish. The mugger, by contrast, has a short, broad, powerful snout more typical of a 'classic' crocodile.

Adult male gharials carry a second giveaway: a bulbous growth on the tip of the snout that resembles an earthenware pot called a 'ghara' in Nepali and Hindi, which is where the species gets its name. Muggers have no such bump. Behaviour and diet also differ. Gharials feed almost entirely on fish and are essentially harmless to people, whereas muggers are opportunistic and eat fish, turtles, snakes, birds, mammals and carrion, and can occasionally be dangerous.

Size and posture round out the picture. Male gharials can reach 3-6 metres and females 2.6-4.5 metres, but their legs are weak, so they haul out awkwardly onto sandbanks close to water and rarely stray far. Muggers grow to around 4-5 metres, walk more easily on land, climb banks and rocks, and move farther from the water to bask and nest.

Nepal's gharials survive today in only a handful of river systems, all in protected areas. The stronghold is the Narayani-Rapti river system inside Chitwan National Park in central Nepal, with a second population in the Karnali and Babai rivers of Bardiya National Park in the west. Historically gharials also lived in the Koshi and Mahakali (Mahakali/Sarada) rivers, but those populations have been lost, leaving only these remnant groups.

The Rapti River in Chitwan now holds the largest gharial numbers in the country, largely thanks to decades of releases from the Kasara breeding centre. Surveys in recent years have recorded gharials spread across roughly four rivers only, underlining how narrow the species' range has become. In early 2024, park counts put Chitwan's gharials at 265 animals, split between the Rapti (about 152) and the Narayani (about 113).

Muggers are more widely distributed. Beyond Chitwan and Bardiya, they occur in Shuklaphanta National Park, the Koshi Tappu Wildlife Reserve, and lake complexes such as Ghodaghodi and Beeshazari, as well as many smaller wetlands. Because muggers tolerate still and man-made water bodies, they are the crocodile most visitors are likely to see on a jungle drive or lake visit in the Tarai.

The gharial has been listed as Critically Endangered on the IUCN Red List since 2007, the highest threat category before extinction in the wild. Global estimates around 2019 suggested only about 650 mature adults survive worldwide, spread thinly across India and Nepal, out of a total wild population of perhaps 900 individuals. This makes every breeding female significant, and Nepal's few hundred animals an internationally important share of the species.

Nepal gives the gharial exceptional legal status. Under the National Parks and Wildlife Conservation Act, 2029 BS (1973 AD), only three reptile species are protected in the country: the gharial, the Asiatic rock python (Python molurus) and the golden monitor lizard (Varanus flavescens). Killing, harming or trading a protected species carries heavy penalties. The gharial is also listed on Appendix I of CITES, the Convention on International Trade in Endangered Species, which bans international commercial trade.

The species collapsed within living memory. In the mid-1970s only around 70-80 gharials were thought to remain in Nepal's rivers, victims of egg collection for food and medicine, hunting for skins, drowning in fishing nets, overfishing of their prey, river pollution, dam building and habitat loss. That crisis prompted the government to set up a dedicated breeding programme rather than rely on the wild population to recover on its own.

The Gharial Conservation Breeding Center was established in 1978 at Kasara, the headquarters area of Chitwan National Park. Its method is 'head-starting': staff collect eggs from natural sandbank nests along the rivers, incubate and hatch them safely, then rear the young gharials in captivity for several years until they are large enough to have a better chance of surviving predators and fishing nets before being released into the wild. The National Trust for Nature Conservation (NTNC), through its Biodiversity Conservation Center, supports the government in running the centre, monitoring hatchling growth, releasing juveniles and tracking them afterwards.

Releases have continued since 1981. By 2024, park and centre figures indicated that more than 1,880 captive-reared gharials had been released from Kasara into six river systems, the great majority into the Rapti (over 1,150) and the Narayani (over 400), with smaller numbers into the Saptakoshi, Babai, Karnali and Kaligandaki. A second crocodile conservation centre was set up in Bardiya National Park in 1982 to support the western population. Releases are ongoing: batches of dozens of young gharials are freed into the Rapti in most years, and in March 2024 twenty-five radio-tagged gharials were even translocated to the Chaudhar River in Shuklaphanta to try to establish a new population.

The programme has clear successes and clear limits. It has kept the gharial from vanishing in Nepal and has rebuilt the Rapti into the country's best gharial river. However, the survival rate of released animals in the wild remains low: one analysis noted that although about 404 gharials were released between 2017 and 2022, the wild population grew by only around 80 in the same period. Conservationists therefore stress that captive breeding alone is not enough without healthier, safer rivers.

The mugger (Crocodylus palustris), also called the marsh crocodile, is Nepal's other crocodilian and is listed as Vulnerable on the IUCN Red List, a less severe category than the gharial's. It is a medium-to-large crocodile that rarely exceeds about 5 metres, with the broad snout, bony head and heavy build people usually picture when they think of a crocodile. Both crocodile species are protected internationally under CITES Appendix I.

Muggers are more numerous and far more adaptable than gharials. Published surveys have recorded on the order of 397 muggers in and around Chitwan National Park, around 35 in and around the Koshi Tappu Wildlife Reserve, and roughly 26 in the Ghodaghodi lake complex, among other sites. They occupy rivers, swamps, lakes, marshes and man-made ponds and reservoirs, which is why they cope with disturbed landscapes better than the fussy, river-dependent gharial.

This adaptability has a downside: because muggers live close to farms, fishers and villages, they are the crocodile most often involved in human-wildlife conflict in the Tarai, whether attacking livestock, becoming entangled in nets, or being seen as a threat near bathing and fishing spots. Managing that coexistence is a growing focus for park authorities and local communities.

Both crocodiles face broadly the same pressures. Overfishing removes the prey gharials depend on, while gill nets drown crocodiles of both species. Sand and boulder mining, dams, irrigation intakes and other infrastructure change river flows and destroy the sandbanks gharials need to bask and nest. Pollution, encroachment on riverbanks and disturbance from people compound the problem, and climate-driven changes in river flow add further uncertainty.

The response combines protected-area enforcement, continued head-starting and release from Kasara and Bardiya, radio-tracking of released animals, and efforts to keep key stretches of the Rapti, Narayani, Karnali and Babai free of destructive fishing and mining. Encouragingly, Chitwan's gharial count rose from 239 in 2023 to 265 in early 2024, an increase of roughly 11 percent, suggesting the long effort is slowly paying off.

For visitors and students, the takeaway is simple. A crocodilian with a thin, tube-like snout basking on a river sandbank is almost certainly a gharial, a Critically Endangered, strictly protected animal that should never be disturbed. One with a broad, blunt snout in a lake, marsh or slow channel is a mugger. Both are reminders of how much Nepal's rivers still hold, and how fragile they have become.