The pig-nosed turtle (Carettochelys insculpta), also called the Fly River turtle, is one of the world's most distinctive freshwater turtles. It has a fleshy pig-like snout, a smooth leathery shell, and broad paddle-shaped forelimbs that make it look more like a small sea turtle than a typical river turtle.
It is also evolutionarily unusual: the pig-nosed turtle is the only living species in the family Carettochelyidae. It occurs naturally in northern Australia and New Guinea, where it spends almost its entire life in rivers, lagoons, floodplains, swamps, and other tropical aquatic habitats. Its global conservation status is currently Endangered, and international trade is regulated under CITES Appendix II.
Pig-Nosed Turtle Facts at a Glance
| Feature | Information |
|---|---|
| Scientific name | Carettochelys insculpta |
| Other names | Fly River turtle, pitted-shelled turtle, Warrajan |
| Family | Carettochelyidae |
| Range | Northern Australia, Papua New Guinea, and Indonesian Papua |
| Habitat | Rivers, lagoons, swamps, floodplains, lakes, waterholes, and some brackish habitats |
| Diet | Omnivorous; fruits, seeds, aquatic plants, molluscs, crustaceans, insects, fish, and carrion |
| Adult size | Large freshwater turtle; large females can exceed 50 cm in shell length |
| Activity | Highly aquatic; males remain in the water and females leave mainly to nest |
| IUCN status | Endangered |
| CITES | Appendix II |
The pig-nosed turtle is recognizable by its fleshy snout, leathery shell, and paddle-like limbs.
Scientific Classification
| Kingdom | Animalia |
|---|---|
| Phylum | Chordata |
| Class | Reptilia |
| Order | Testudines |
| Family | Carettochelyidae |
| Genus | Carettochelys |
| Species | Carettochelys insculpta |
The species is especially important from an evolutionary perspective because it is the sole surviving member of Carettochelyidae. Fossil relatives of this lineage were once much more widespread, but today only the pig-nosed turtle remains.
What Does a Pig-Nosed Turtle Look Like?
The pig-nosed turtle is named for the enlarged fleshy snout that projects forward from its face. The nostrils sit near the end of the snout, allowing the turtle to breathe at the surface while keeping much of its body underwater.
Its shell is also unusual. Instead of the hard scutes found on many turtles, the carapace is covered with smooth leathery skin. The upper surface is usually gray, olive, or brownish, while the underside is pale.
The limbs are broad and flattened into powerful paddles, particularly the forelimbs. Each flipper has claws, but the overall shape is much more streamlined for swimming than walking. Females are generally larger than males, while males tend to have longer, thicker tails.
How Big Do Pig-Nosed Turtles Get?
Pig-nosed turtles are among the larger freshwater turtles. Adult shell length varies between populations, and females grow larger than males. Published measurements place large females above 50 cm in straight carapace length, while some general references describe exceptionally large individuals approaching 60–70 cm.
Because body size varies by sex, locality, and measurement method, it is better to treat a single “maximum size” figure as an approximation rather than a fixed value for every adult.
Where Do Pig-Nosed Turtles Live?
The natural range is restricted to northern Australia and New Guinea. In Australia, important populations occur in river systems of the Northern Territory. The species is also found in Papua New Guinea and Indonesian Papua.
Suitable habitats include:
large freshwater rivers
lagoons and billabongs
swamps and floodplain wetlands
lakes and waterholes
river channels with sandy nesting banks
some estuarine or brackish environments
The pig-nosed turtle is much more aquatic than many familiar freshwater turtles. Males remain in the water throughout their lives, while females normally leave the water only when they climb onto riverbanks or beaches to lay eggs.
Do Pig-Nosed Turtles Bask on Logs?
Not in the way many pond turtles do. The previous version of this article described pig-nosed turtles as frequently basking on rocks or logs, but that is misleading.
This species is highly specialized for aquatic life. Its paddle-shaped limbs make movement on land awkward, and adult males do not normally leave the water. Females come ashore primarily for nesting.
This difference is important because the pig-nosed turtle should not be treated like a typical semi-aquatic basking turtle.
What Do Pig-Nosed Turtles Eat?
Pig-nosed turtles are omnivores, but plant material can form a large part of the diet. Australian government sources document feeding on fruits, seeds, leaves, flowers, aquatic vegetation, and algae, along with animal foods such as molluscs, crustaceans, insects, fish, and carrion.
Foods recorded in the wild include fruits and flowers from riparian plants as well as aquatic plants such as ribbonweed. Their broad diet allows them to exploit food both in the water and from vegetation growing beside rivers.
Behavior and Movement
Pig-nosed turtles are strong swimmers and may show both site fidelity and substantial local movement. Radio-tracking studies in northern Australia have found that some females travel farther than males, especially when searching for suitable nesting areas.
During seasonal flooding, turtles can leave the main river channel and move into floodplains, billabongs, or swamp habitats. These movements are local responses to river conditions rather than long-distance migrations comparable to those of sea turtles.
Research has also documented underwater vocalizations consistent with contact calls, adding to evidence that freshwater turtles can use acoustic communication more than was once assumed.
Reproduction and Nesting
Reproduction is strongly tied to seasonal river cycles. In northern Australia, nesting generally occurs during the dry season. Females leave the water and dig nests in sandy riverbanks above the normal water level.
Clutch size varies, and females may produce more than one clutch in a breeding season. The species is slow to mature, which means heavy loss of adults or nesting females can be difficult for populations to replace.
The Unusual Way Pig-Nosed Turtle Eggs Hatch
One of the most remarkable features of the pig-nosed turtle is embryonic aestivation. The embryo develops inside the egg until it is nearly ready to hatch, then development pauses.
The hatchling can remain inside the egg waiting for environmental conditions to change. The first heavy rains or rising floodwater reduce oxygen around the nest and trigger synchronized hatching. This timing helps young turtles emerge when the wet season is beginning and aquatic habitat is expanding.
The species also has temperature-dependent sex determination, meaning nest temperature influences whether hatchlings develop as males or females.
Why Is the Pig-Nosed Turtle Endangered?
The pig-nosed turtle is currently assessed globally as Endangered. This is an important correction to the older version of this page, which listed the species as Vulnerable.
Threats differ across its range. Important pressures include:
Egg and turtle harvest: collection for food and trade has been heavy in parts of New Guinea.
Illegal and international pet trade: hatchlings have been collected in large numbers for the exotic-pet market.
Habitat degradation: logging, agriculture, mining, and changes to riverbanks can damage aquatic and nesting habitats.
Livestock and feral animals: buffalo and cattle can trample nesting sites and alter riparian vegetation in northern Australia.
Changes to river flow: water extraction and altered flood regimes can reduce access to feeding areas and nesting banks.
Climate change: changes in rainfall, flooding, temperature, and nesting conditions can affect survival and reproduction.
CITES and the Pet Trade
Carettochelys insculpta is listed in CITES Appendix II. That does not mean every specimen is completely banned from international trade, but international commercial movement is regulated and requires appropriate documentation.
The species has been heavily targeted for the pet trade, particularly as hatchlings. Buyers should never assume that an animal offered online or in a market was legally sourced simply because it is available for sale.
Pig-nosed turtles are also poor choices for casual home aquariums. They become large, require substantial water volume and specialist care, and can live for many years.
Pig-Nosed Turtle vs Softshell Turtle
| Feature | Pig-Nosed Turtle | Typical Softshell Turtle |
|---|---|---|
| Family | Carettochelyidae | Trionychidae |
| Shell covering | Leathery skin | Leathery skin |
| Forelimbs | Broad paddle-like flippers | Webbed feet |
| Snout | Prominent pig-like fleshy snout | Usually tubular or pointed |
| Lifestyle | Extremely aquatic | Highly aquatic, but body form differs by species |
The similarities are an example of convergent adaptation to aquatic life. Pig-nosed turtles are not members of the true softshell turtle family even though their shells look superficially similar.
Why the Species Is Evolutionarily Important
The pig-nosed turtle represents an entire surviving family by itself. Losing this species would therefore mean losing not just one turtle species, but the last living branch of Carettochelyidae.
Recent genetic research has also found strong geographic structure among Australian, Papua New Guinean, and Indonesian Papua populations. This means conservation needs to consider the genetic differences between regional populations rather than treating all pig-nosed turtles as one freely mixing population.
For more turtle and reptile profiles, browse the Reptiles section. You can also explore the site's Endangered Animals section.
Frequently Asked Questions
Why is it called a pig-nosed turtle?
The name comes from its fleshy projecting snout, with nostrils positioned near the tip. The snout helps the turtle breathe at the surface while much of its body remains underwater.
Is the pig-nosed turtle a softshell turtle?
No. It has a leathery shell similar in appearance to softshell turtles, but it belongs to a different family, Carettochelyidae. It is the only living species in that family.
Where do pig-nosed turtles live?
They are native to northern Australia and New Guinea, including Papua New Guinea and Indonesian Papua. They inhabit rivers, lagoons, floodplains, swamps, lakes, and related tropical aquatic habitats.
Do pig-nosed turtles leave the water?
Adult males remain aquatic. Females normally leave the water only to nest on sandy riverbanks or beaches.
What do pig-nosed turtles eat?
They are omnivores. Their diet includes fruits, seeds, leaves, aquatic plants, algae, molluscs, crustaceans, insects, fish, and carrion.
Are pig-nosed turtles endangered?
Yes. The current global IUCN assessment lists the pig-nosed turtle as Endangered. International trade is also regulated under CITES Appendix II.
Can pig-nosed turtles be kept as pets?
They are traded in captivity in some countries, but they are large, highly aquatic, long-lived, and subject to wildlife-trade regulations. Anyone considering one must first check national and local laws and verify legal origin.
Official and Reference Sources
Final Takeaway
The pig-nosed turtle is not simply an unusual-looking freshwater turtle. It is the last living member of an entire turtle family, highly adapted to aquatic life, and capable of remarkable reproductive behavior in which fully developed hatchlings wait inside their eggs for seasonal flooding. Its Endangered status reflects pressures from harvest, wildlife trade, habitat degradation, altered rivers, and other threats across its restricted Australo-Papuan range.
