Gharial: an old-looking lineage built for fish and rivers

The gharial’s jaws are so long and thin that in a 2012 bite test it scored the lowest relative bite force of any living crocodilian, though only two animals were tested. That sounds like a flaw. It is closer to a trade: the animal gave up crushing power and got a fish trap in return.

The gharial (Gavialis gangeticus) also sits on a puzzle. It looks like something left over from the age of dinosaurs. Two recent studies of the crocodilian family tree agree that the gharial’s closest living relative is another long-snouted species, the false gharial, but they disagree on how old the gharial branch really is and on which long-snouted fossils belong to it.

This article covers the snout, the river life that goes with it, the ghara (the pot on a male’s nose), and the debate over the lineage’s age. It ends with the animal’s status, which is serious. The gharial is a large animal, and this is not a guide to handling crocodilians. They are best watched from a distance.

Meet the gharial

The gharial is a fish-eater of big, clear rivers in the northern part of the Indian subcontinent. The IUCN Crocodile Specialist Group’s action plan says it was historically found in the Indus, Ganges, Mahanadi and Brahmaputra river systems, and, as of that 2010 document, lists it as present in India and Nepal, with Bhutan, Myanmar and Pakistan marked extinct and Bangladesh uncertain.

Size figures wobble between sources. The Animal Diversity Web, a University of Michigan database, gives males 5 to 6 m and a mass of 159 to 181 kg, in line with the action plan’s roughly 160 kg. It also lists an average length of 6 m, which sits oddly next to its own male range, so treat lengths as approximate. The weights look low for the longest lengths: the two gharials in the 2012 bite study averaged 326 cm and 112 kg, so a 160 kg figure probably fits adults well below 5 to 6 m.

A snout built for fish, not for force

In the 2012 PLOS ONE bite study led by Gregory Erickson, only two gharials were tested, with a mean mass of 112 kg and a mean length of 326 cm. Their back-tooth bite averaged 1,895 newtons. In the same table, an American alligator of 142 kg bit with 5,117 newtons. The paper says the gharial has the lowest relative bite force among living crocodilians. The sample is tiny, so it is a strong hint, not a final number.

The authors suggest why the snout is shaped this way. Long, slender jaws give a wide strike zone during side-to-side head sweeps, allow the tip to snap shut quickly, and probably leave the eyes a clearer view of the target. The jaw muscles pay for that speed with force. The authors also note that slender snouts are weak in bending, which the animal seems to offset by eating small, light prey. They call the gharial arguably the only truly fish-eating crocodilian. The action plan says very large individuals are reported to eat other prey.

The teeth tell a related story. They are slender, and one summary of the paper’s table gives a front-tooth contact area of 0.81 square millimeters, which helps a weak bite press hard at the tip. The reported front-tooth pressure, about 1,154 megapascals, is close to the top of the study’s range. For comparison with a bigger, blunter biter, see the Saltwater crocodile.

Built for rivers, not for land

The action plan calls the gharial arguably the most thoroughly aquatic living crocodilian and says adults apparently cannot walk in the semi-upright stance other crocodilians use. The Animal Diversity Web says the feet are extensively webbed and that on land the animals slide along on their bellies. Adults leave the water mainly to bask and nest on mid-river sandbars, and they gather at river bends and deep, slow stretches.

Nesting follows the river’s calendar. The action plan says females dig hole nests in river sand banks in the dry season, lay 30 to 50 eggs, and produce the largest eggs of any crocodilian, averaging about 160 g. The Animal Diversity Web gives a lower average of 100 to 156 g, so the sources differ.

Gharial mothers also break a family habit. The action plan says most other crocodilians carry their young from the nest in their mouths, but the gharial does not appear to, because of the unusual shape of its jaws. It adds that care after hatching has been observed. The Nile crocodile article looks at crocodilian nests and mothers in more detail.

The ghara: a pot on the nose

Adult males grow a bulbous growth on the snout tip that looks like an Indian pot called a ghara, which is where the species gets its name. The plan says its function is not well understood. It may be a visual sex signal, a sound resonator, or part of bubbling and other courtship behavior. The Animal Diversity Web says males use it in courtship and territorial displays and that it helps produce bubbles and a buzzing sound.

How old is the lineage?

Here the scientists really do disagree. A few terms help. A thoracosaur is an extinct long-snouted crocodilian. A gavialoid is a member of the gharial branch of the tree. Ma means million years ago.

Lee and Yates say the older, gharial-like fossils are probably not true gharials, and that unmistakable gharial fossils are younger than about 20 Ma. Rio and Mannion report that their anatomy-only analysis, for the first time, puts the gharial next to the false gharial. They also warn that support for many branches is low and that some analyses left more than 400,000 equally good trees. These are our readings of summaries, so check the papers before quoting dates.

Common mistakes and myths about the gharial

Myth: it is a living fossil, unchanged for ages. One study finds living gharials a young group, and says that older fossils with a similar snout may be copies of the design, not ancestors. Another gives different dates. Either way, “unchanged” is a stretch.

Mix-up: gharial and false gharial. They are different species. The false gharial is also long-snouted and, in both studies, is the gharial’s nearest living relative.

Mix-up: a long snout means a strong bite. In the 2012 test it meant the opposite, though only two gharials were measured.

Mix-up: we know exactly what the ghara is for. The action plan says its function is not well understood, and lists display, sound and bubbling as candidates.

Mix-up: all crocodilians walk the same way. The action plan says other crocodilians, such as the American alligator, can walk in a semi-upright stance on land. Adult gharials apparently cannot.

Conservation status

The gharial is listed as Critically Endangered on the IUCN Red List of Threatened Species. That is the category as distributed by GBIF, the Global Biodiversity Information Facility, and we checked it on November 9, 2026. Critically Endangered means the species is judged to face an extremely high risk of extinction in the wild.

The pressures are mostly about rivers and people. The action plan names habitat destruction, pollution, sand mining, dams and barrages, hunting for skins, medicinal killing, egg collection, and drowning in fishing nets, where tangled animals are sometimes killed or de-beaked. It reports that in the winter of 2007 to 2008 more than 100 gharials died in the Chambal River, and that pollution was suspected. The Animal Diversity Web instead mentions a gout outbreak possibly linked to an introduced fish, so the cause is debated in our sources.

The plan describes a decline of over 80% since the 1940s, and reports surveys of around 1,675 animals (436 adults) in 1997 and 1998 but fewer than 200 breeding adults and about 834 in total in 2006. Releases of captive-raised young have generally failed to start viable populations in new places. Those figures come from a 2010 document, so we have no confirmed current trend.

Categories are reviewed and can change, and the copy GBIF distributes can trail the IUCN website by some months, so the date matters. GBIF’s copy does not give the year of the IUCN assessment, so we do not state one. For current numbers, check the IUCN Red List itself.