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Feature Destination: New Caledonia’s Coral Reefs Offer a Glimmer of Hope for the Future

By Liz Thompson and Renée Carlton

Scientists on the Global Reef Expedition explored New Caledonia’s remote coral reefs, some for the first time.

a coral surrounding by black and white fish
Photo credit: ©Khaled bin Sultan Living Oceans Foundation.

In the South Pacific Ocean, at the edge of the Coral Sea, lay some of the most remarkable and well-protected coral reefs in the world. The reefs of New Caledonia are simply stunning. With high biodiversity, relatively healthy reef fish communities and exceptional coral cover, these reefs are simply a wonder to behold. 

A popular tourist destination, New Caledonia knew the importance of their coral reefs and created a giant Marine Protected Area (MPA) to conserve them. One of the largest MPAs in the world, the Natural Park of the Coral Sea (Le Parc Naturel de la Mer de Corail) protects more than a million square kilometres of marine habitats, including the Lagoons of New Caledonia Marine World Heritage site. This park was designated to protect the natural and cultural heritage of New Caledonia, enforce sustainable use of its marine resources, and develop an internationally recognized marine conservation area that will contribute to the conservation of marine habitats globally.

Scientists at the Khaled bin Sultan Living Oceans Foundation came to New Caledonia in 2013 to study these reefs on the Global Reef Expedition—the largest coral reef survey and mapping expedition in history. The Khaled bin Sultan Living Oceans Foundation set out on the Global Reef Expedition to study the health and resiliency of coral reefs around the world. The expedition circumnavigated the globe surveying and mapping coral reefs in an effort to address the coral reef crisis. On the Global Reef Expedition mission to New Caledonia, an international team of scientists spent more than a month at sea working closely with local experts to assess the reefs around Grande Terre, the Entrecasteaux Atolls, and Ile des Pins. Together, they conducted over 1,000 surveys of corals and reef fish and mapped over 2,600 km2 of shallow-water marine habitats in 10 locations throughout the country. The expedition visited some of the most remote reef systems in New Caledonia, some of which were surveyed and mapped for the first time.  

Of the 22 research missions the foundation conducted in the Western Atlantic, Pacific, and Indian Oceans, the reefs of New Caledonia stood apart as some of the most beautiful and well-preserved.

Surviving, despite the odds

Scientists on the Global Reef Expedition found the reefs to be surprisingly healthy, even in a few unexpected locations, according to a report released last month summarizing the foundation’s findings from the research mission. New Caledonia’s reefs were covered in abundant and diverse coral and fish communities. Offshore reefs were in especially good shape and still had healthy populations of large and commercially important fish at the time the surveys were conducted. 

However, many nearshore reefs showed signs of fishing pressure. Few large fish remained on nearshore reefs, particularly those close to coastal communities, which were dominated by small and medium-sized fish that were lower on the food chain. One notable exception was Prony Bay, which had the highest live coral cover observed in New Caledonia, and some of the most diverse coral communities observed anywhere on the Global Reef Expedition. 

A truly remarkable place 

Prony Bay was an unlikely place to find stunningly diverse and think coral reefs. Downstream of a nickel mine, from which a fine red silt flows into the bay, Prony Bay had incredible coral communities that were well adapted to the harsh environment. No one was expecting to find flourishing coral communities in these turbid waters, but a robust and diverse coral community is exactly what was found. Although a thin layer of silt covered the seafloor, it seemed to have little negative impact on coral cover and diversity. Large plating corals, vast expanses of branching corals, and many uncommon species such as the trumpet coral and endemic mushroom coral covered the reefs. This location was one of the hidden gems found on the Global Reef Expedition and gave the scientists hope that coral could thrive even in unexpected places.

The reefs of New Caledonia are home to 1,700 species of fish and over 450 species of coral, making the diving and research here some of the most interesting undertaken on the Global Reef Expedition. New Caledonia is an important sanctuary for many marine animals. Numerous species of fish, whales, sharks, sea turtles and marine birds come to New Caledonia to reproduce and raise their young. The biodiversity of the reefs of New Caledonia foster a safe and healthy environment for these animals, and the conservation efforts undertaken by the country, particularly in the northern region and Entrecasteaux Atolls, have helped preserve these important nursery and rookery sites.

A global leader in marine conservation

Coral reefs are an essential ecosystem that provides food, protection from storms, and income generation and are also culturally important in many parts of the world. In New Caledonia, as elsewhere, coral reefs are gravely threatened by a variety of factors, both natural and man-made, including overfishing, hurricanes, pollution, disease, outbreaks of crown-of-thorns starfish, and climate change. Some stressors are caused by direct impacts from coastal communities, such as overfishing of nearshore fisheries and pollution, and some are larger, more global stressors such as coral bleaching and ocean acidification. These threats to coral reefs are not going to go away, but there are still things people can do at a local level to minimize their impact to the reefs. By reducing the local stressors through robust management efforts, this will alleviate pressures on reefs from the global stressors that are harder to control. Focusing local management on things like fishing, marine resource extractions, pollution, and localized runoff are all ways countries like New Caledonia are helping to reduce these stressors on coral reefs and enhance their ability to survive—and recover from—major disturbance events.

The Global Reef Expedition: New Caledonia Final Report provides a comprehensive summary of our findings from our research mission to assess the health and resiliency of coral reefs in New Caledonia along with recommendations for preserving these reefs into the future.

With one of the largest MPAs in the world, New Caledonia is already considered a global leader in marine conservation. Their efforts to protect coral reefs are some of the most progressive in the South Pacific, but there is still work to be done.  

A common problem with many of the marine parks surveyed on the Global Reef Expedition is the lack of nearshore regulations to protect the valuable nearshore reef habitats and fish populations. In many areas, fishing pressures from local communities are either unchecked or minimally checked, leaving the fish communities at risk of collapse. New Caledonia has tried to address this by creating strict fishing regulations in the northern Entrecasteaux Atolls and Cook Reef. However, around Ile des Pins and Grande Terre where most of the population lives, regulations are lacking. These areas, particularly around Ile des Pins, had few large fish and could benefit from stronger fishing regulations. 

Park managers and government officials in New Caledonia were eager to get their hands on the report and maps summarizing the findings from the Global Reef Expedition, as it contains valuable baseline data on the state of the reefs at a point in time. The high-resolution habitat maps created on the GRE were designed to be used by government officials, community leaders, and managers. These maps, along with the survey data collected on the Global Reef Expedition, can help managers identify areas that could benefit from increased protection, such as improved enforcement of existing regulations, or by establishing no-take, no-entry areas.

With continued commitment from the government, Provinces, and local communities, conservation of New Caledonia’s marine resources can be some of the best in the world. The Khaled bin Sultan Living Oceans Foundation hopes that the data collected on the Global Reef Expedition will inform ongoing marine conservation and management efforts to protect coral reefs and fisheries in New Caledonia so that these reefs continue to thrive for generations to come. 

To learn more about the findings from this research mission, download the Global Reef Expedition: New Caledonia Final Report, or explore the habitat and bathymetric maps of New Caledonia’s coral reefs, visit the foundation’s website at www.livingoceansfoundation.org.

About the Authors

Renée Carlton is a marine ecologist at the Khaled bin Sultan Living Oceans Foundation, where she studies the health and resiliency of coral reef ecosystems. She is an author of the foundation’s most recent publication, the Global Reef Expedition: New Caledonia Final Report.

Liz Thompson is the Director of Communications at the Khaled bin Sultan Living Oceans Foundation where she writes about marine science, conservation, and life on coral reefs. 

Photo credit: ©Khaled bin Sultan Living Oceans Foundation, unless otherwise noted.


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Art & Culture

Sixteen days in Tunisia

Bab Al-Bhar, the historic Sea Gate of Tunis, once opened directly onto the Mediterranean. Today, white colonial buildings stand where water once lapped at the city walls.
Bab Al-Bhar, the historic Sea Gate of Tunis, once opened directly onto the Mediterranean. Today, white colonial buildings stand where water once lapped at the city walls.

Tunisia is named after Tunis. Not the other way around. If the country takes its name from the city, then any attempt to understand Tunisia must start in Tunis.

Before reading any further, look at a map. You must appreciate the exceptional location of Tunis; only then does the city make full sense. Historically, Tunis was little more than a compact nucleus pressed in the strip of land between the Séjoumi lagoon (a flamingo sanctuary) and Lake Tunis, once the natural harbour. Everything that now feels expansive, avenues, neighbourhoods, infrastructure, rests on land reclaimed from water. Bab Al-Bhar, the Sea Gate, crystallises this transformation: standing there today, flanked by white buildings, you have to imagine the water once visible straight through the gate. The city quite literally stole land from the sea as it expanded.

That tension between land and water, between natural geography and human intervention, repeats itself everywhere in Tunisia. An artificial peninsula appears in the ancient harbours of Carthage. Salt lakes replace vanished seas in Chott el Djerid. Urban coastlines are pushed back, fortified, paved over. Today, the landscape bears the marks of centuries of negotiation with water, sometimes reverent, sometimes violent. But let’s stay in the capital for a moment.

Visiting the medina (old town) on a Sunday, when most souks are closed, made the architecture audible. Without the commercial noise, proportions, light and texture take over; the business-day buzz is thrilling, but silence teaches you how the city breathes. That quiet also sharpens your attention to thresholds. And then the beauty of the doors hits you. Again and again. Painted, carved, symbolic, they demand to be read, often concealing unexpected worlds behind them. In the medina, access is never guaranteed: museums may still be family homes, so you knock, you wait and someone might let you in. Knowledge survives through generosity. This constant negotiation between private and public space explains why repurposing feels so natural here. People inhabit ancient burial sites, former shrines become cafés and even the old slave market has transformed into the jewellers’ quarter; history reused rather than erased. The twenty madrasas scattered through the medina embody this logic perfectly: still embedded in daily life, neither fully public nor entirely private, their doors test your luck. Finally stepping inside one felt unreal, courtyards opening suddenly, tiled interiors that seemed imagined rather than constructed. I honestly felt I was dreaming.

But don’t forget to look up, as architecture constantly communicates power, belief and belonging, often far more than we initially perceive. The green-tiled domes signalling burial places, the octagonal or patterned motifs minarets proclaiming variants of Islam (Ottoman and Almohad respectively) or the colour codes identifying hammams and barber shops all speak a visual language that locals instinctively read. In Tunis, belief is never private, it is inscribed into skylines and façades.

That inscription extends inward. Mosques feel less like austere institutions than wellness centres, spaces of rest, learning and calm. Mats are placed against ancient columns to shield people’s backs from the cool marble. I even witnessed people nap inside Al-Zaytuna. So much peace that you can sleep. How do churches compare?

The courtyard of Al-Zaytuna Mosque in Tunis, built in the seventh century with repurposed Roman columns. The Great Mosque remains the spiritual and commercial heart of the medina.
The courtyard of Al-Zaytuna Mosque in Tunis, built in the seventh century with repurposed Roman columns. The Great Mosque remains the spiritual and commercial heart of the medina.

Al-Zaytuna itself is the city’s anchor, the Great Mosque. The souks grew around it, originally as little more than rented awnings, now covered streets wrapping commerce around devotion. You walk through trade and suddenly stumble into the sacred. Built in the seventh century, shortly after the Islamic conquest of Byzantine Africa, the mosque stands on layers of belief. While it is likely that a temple existed here since antiquity, legend says it was built on the shrine of Saint Olive of Palermo. “Zaytuna” means olive, in Arabic and in Spanish. Language preserves memory even when stones are repurposed. Indeed, the entire prayer hall is held by a forest of Roman columns and capitals, older worlds literally supporting newer ones.

As a Spaniard, Tunisia had many a surprise in store for me. Rue des Andalous reveals one of Tunisia’s most consequential migrations. During the Middle Ages, much of Spain was Muslim. Forced conversions, expulsions and finally the mass expulsion even of Moriscos (former Muslims converted to Christianity) in 1609 drove tens of thousands across the sea. Spain was Al-Andalus in Arabic and so these Spaniards became known as “Andalusians”. Large numbers settled in Tunisia, founding neighbourhoods and entire industries. That legacy is not abstract. Chechias, the characteristic red felt hats associated with Tunisois men, were produced using techniques brought by Andalusian refugees. By the nineteenth century, chechia makers were among the wealthiest and most influential merchants in Tunis. The Tunis souks where you can still watch them work are living archives of forced migration turned cultural inheritance. Indeed, the link with Al-Andalus is still emotionally present. Several people called me “cousin” when I told them I was Spanish. It did not feel metaphorical. It felt familial. Spanish presence resurfaces repeatedly: forts at La Goulette, inscriptions in Castilian, Andalusian refugees founding towns like Testour, where the mosque clock runs backwards (‘anticlockwise’) like Arabic script. Jewish and Muslim Spaniards built whole towns together after fleeing persecution. They brought urban planning, architecture, food and memory.

The ribat of Monastir, a fortified Islamic monastery, now separated from the Mediterranean by a modern coastal road. The ancient fortress once stood directly on the beach.
The ribat of Monastir, a fortified Islamic monastery, now separated from the Mediterranean by a modern coastal road. The ancient fortress once stood directly on the beach.

Non-human animals are also everywhere if you know where to look, silently narrating human history. Today, cats dominate Tunis, lounging, glamorous, fully at home in the city. But North Africa was once also home to another feline: lions, ultimately erased from the landscape by hunting. At the Bardo museum, Roman mosaics celebrate them while also depicting their mass slaughter in amphitheatres. Venationes (gladiatorial hunting shows) paved the way to extinction long before modern poaching. Rome’s “games” were ecological disasters disguised as entertainment. El Djem boasts the third largest amphitheatre in the world, an uncomfortable reminder that the spectacle of violence against animals became industrial. Birds, too, mark survival. Storks now nest on electrical poles, thanks to recent conservationist efforts, and the ancient castle on the artificial Chikly island in Lake Tunis is now a natural reserve for over fifty-seven species.

Water management reveals another continuity of power. Ancient Carthage was defined by water engineering. Artificial harbours, commercial and naval, remain legible after 2,200 years. Aqueducts carried water across vast distances; cisterns stored enough to sustain one of the Mediterranean’s largest cities. Fresh water was sacred. Springs, such as that at Zaghouan, were divine. Nymphs were believed to guard the source so temples rose where water emerged from the rock. But human transformations of the landscape sometimes rival natural phenomena. Chott el Djerid, now a salt desert, was once part of the Mediterranean Sea. When geological shifts cut it off, the water evaporated, leaving salt behind. The salt is now actively extracted and shipped north, sold to Scandinavian countries as grit to combat icy roads. At the same time, visions of reversing this desiccation persist, from colonial-era schemes to the revival of the “Sahara Sea” project in the 2010s, approved by the Tunisian state in 2018. Coastlines have also been shaped by humans. Hammamet’s medina once met the waves directly. Boulders and walkways intervened. Monastir’s ribat once stood on the beach before roads severed it from the sea. Sousse’s medina now violently cut away from the Mediterranean. Tunisia has never stopped imagining how to reshape water.

Just as water and animals shape human settlement, so too does climate. Again and again in Tunisia, habitation reveals extraordinary adaptation to environment. At the ancient site of Bulla Regia, houses were built partly underground to escape heat, flooding interior spaces with light while sheltering them from extremes. At Matmata, troglodyte dwellings carved into the earth have stabilised temperature in a harsh desert landscape for centuries. At Zriba Olia, a town only abandoned decades ago, Amazigh (Berber) architecture merges seamlessly with mountain rock: the house ends, the mountain begins. Even the Roman theatre at Dougga takes perfect advantage of the mountain’s elevation. These are not picturesque oddities; they are intelligent, time-tested responses to landscape. But changes aren’t always benign, especially when colonial brutality is concerned. In Carthage, Roman policy deliberately buried, erased and levelled the Punic past on Byrsa Hill. Centuries later, French authorities turned amphitheatres into chapels, erected cathedrals atop Punic acropolises and even built a farmhouse on the Roman capitol at Oudna. Layers of civilisation were literally crushed to assert dominance. The irony is that archaeology eventually resurrected what imperial ideology tried to annihilate.

Language binds all of this astonishing diversity together. Phoenician (Punic) script underpins our Latin alphabet. Tifinagh survives among Amazigh communities. Writing systems are fossils of contact. Even humour reveals linguistic layering: Tunisians seem to have the worst, and best, wordplay, producing gems like “Pub-elle”, “Bar Celone” or “Mec Anic”, jokes cleverly built on French that land perfectly in Tunisian streets. Religion, too, refuses neat boundaries. Phoenician deities merge with Egyptian, Persian and Roman gods. Judaism flourished in North Africa from antiquity and remained deeply rooted in Tunisia until the twentieth century. Christianity arrived early, fractured into multiple denominations and left basilicas, cathedrals and martyrs’ narratives across the landscape. Islam absorbed, adapted and reinterpreted what came before. Syncretism is not the exception here, it is the rule.

By the end, what remains clearest is this: Tunisia is not a palimpsest with erased layers. It is an accumulation where nothing disappears entirely. Former seas leave salt. Empires leave infrastructure. Migrations leave words, recipes, and cousins!

Sixteen days is nothing.
And it was everything.


ABOUT THE AUTHOR

Fernando read History at university in London and Paris and currently teaches Languages. You can follow him on Instagram here.

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Aquacultures & Fisheries

Small Scale Fishing in Tunisia Faces Growing Environmental and Economic Strain

For generations, fishing along Tunisia’s coast has been both livelihood and identity. From the shallow tidal flats of the Gulf of Gabès to the small ports of Sfax, Kerkennah, and Mahdia, the sea once offered a reliable rhythm. Fishermen knew the seasons, the winds, and the species that would arrive and depart each year. That knowledge shaped not only income, but family life, food traditions, and entire coastal cultures.

Today, that rhythm is breaking down. Tunisian fishermen are facing a convergence of pressures that few communities are equipped to absorb. Climate change is altering weather patterns and sea conditions faster than local knowledge can adapt. Fish stocks are declining or shifting their ranges. At the same time, destructive bottom trawling has expanded into coastal waters, undermining both ecosystems and the economic viability of small scale fishing.

Together, these forces are eroding a centuries old relationship between people and sea.

Abandoned blue wooden fishing boats lie on a trash strewn shoreline in Monastir, Tunisia, with palm trees and low coastal buildings in the background under a wide, cloud filled sky. The image contrasts natural beauty with visible pollution along the Mediterranean coast. Photo by Giacomo Abrusci for SEVENSEAS Media.
Abandoned fishing boats sit along the shoreline in Monastir, Tunisia, where plastic waste and debris collect at the water’s edge. The scene reflects the growing pressure on Mediterranean coastal ecosystems and the challenges facing local fishing communities. Photo by Giacomo Abrusci for SEVENSEAS Media.

A Coast Shaped by Small Scale Fishing

Tunisia’s fishing history is deeply tied to artisanal practices. With more than 1,300 kilometres of Mediterranean coastline, the country developed one of the largest small scale fishing fleets in the region. The vast majority of Tunisian fishing vessels are small boats operating close to shore, using nets, traps, and fixed gear designed to work with coastal ecosystems rather than against them.

In places like the Kerkennah Islands, fishing traditions such as the charfia system were refined over centuries. Wooden barriers and palm fronds guided fish into enclosures using tides and seasonal movements. These methods depended on healthy seagrass meadows, predictable spawning cycles, and intact coastal habitats. They also reflected a deep understanding of ecological limits.

By the early 2000s, fishing supported tens of thousands of Tunisian families directly and many more through processing, transport, and trade. Fish was both a staple food and an important export, especially to European markets.

That balance is now under strain.

Climate Change Reaches the Docks

The Mediterranean Sea is warming faster than the global ocean average. Rising sea surface temperatures have intensified marine heatwaves, altered currents, and increased the frequency of extreme weather events. For fishermen working in small boats, these changes are not abstract trends. They translate into lost days at sea, damaged equipment, and growing danger.

Fishermen across Tunisia report longer periods of bad weather and storms that arrive with little warning. Conditions that once followed seasonal patterns are now unpredictable. Autumn and winter storms are stronger and more erratic, making it harder to plan fishing trips or ensure safe returns.

Research by international fisheries and climate bodies shows that weather related disruptions already affect fishing activity for a significant portion of the year, particularly in northern and central Tunisia. The risks are highest for artisanal fishermen, whose boats lack the size, shelter, and safety systems of industrial fleets.

In some cases, these risks have been fatal. Storm related sinkings in recent years underscore how climate change is increasing the human cost of fishing in the Mediterranean.

A Sea Rich in Life, and Increasingly Fragile

Beneath Tunisia’s coastal waters lies one of the Mediterranean’s most ecologically important regions. The Gulf of Gabès is unique due to its shallow depth and tidal range, which support vast meadows of Posidonia oceanica seagrass. These underwater forests are among the most productive ecosystems in the sea.

Posidonia meadows act as nurseries for fish, feeding grounds for invertebrates, and carbon sinks that help regulate the climate. Hundreds of marine species depend on them at some stage of their life cycle, including species of commercial importance and others already considered threatened.

Tunisia’s waters also host migratory species, sea turtles, dolphins, and endemic organisms found nowhere else. This biodiversity has long supported artisanal fishing, allowing small scale gear to yield steady catches without exhausting stocks.

However, climate change is weakening this ecological foundation. Warmer waters affect reproduction, oxygen levels, and species distribution. Some fish are migrating north or into deeper waters. Others are declining as habitats degrade.

These changes alone would challenge fishermen. Combined with destructive fishing practices, they become devastating.

The Rise of Bottom Trawling in Coastal Waters

Over the past decade, bottom trawling known locally as kys fishing has expanded dramatically along Tunisia’s coast. Using heavy nets dragged across the seabed, these vessels capture everything in their path. The method is highly efficient in the short term and highly destructive in the long term.

Bottom trawling damages seagrass meadows, disturbs sediments, releases stored carbon, and destroys the complex structures that support marine life. It also tears through the nets and traps used by artisanal fishermen, causing direct economic losses.

Although bottom trawling is regulated under Tunisian law and Mediterranean fisheries agreements, enforcement has struggled to keep pace with its spread. Legal ambiguities, limited monitoring capacity, and misclassification of vessels have allowed trawlers to operate in areas where they are restricted or banned.

In regions such as Sfax and the Gulf of Gabès, the number of kys trawlers has increased sharply since the early 2010s. Many fishermen attribute this rise to declining catches from traditional methods and economic pressure following political and social upheaval after 2011.

The result is a vicious cycle. As trawlers degrade habitats and reduce fish stocks, artisanal fishermen see their catches fall. Some abandon fishing altogether. Others feel compelled to adopt destructive methods themselves, even as they recognise the long term damage.

Economic Stakes Beyond the Shore

Fishing remains economically significant for Tunisia. Annual production reaches well over one hundred thousand tonnes, with a substantial portion exported. European markets are particularly important, making sustainability and traceability critical for trade.

Illegal and indiscriminate fishing practices threaten that relationship. International partners have raised concerns about bottom trawling and enforcement gaps, warning that continued violations could jeopardise exports and reputational standing.

Tunisian authorities have increased inspections, seizures, and surveillance in recent years, and have acknowledged both progress and limitations. With a long coastline and limited resources, oversight remains uneven.

Meanwhile, coastal communities bear the consequences first.

Lives Caught in the Middle

On the docks, the impacts are deeply personal. Fishermen speak of species that once fed families now becoming luxuries. Octopus, once affordable and common, has become scarce and expensive. Younger fishermen hesitate to invest in boats or start families, unsure whether the sea can still provide a future.

Older fishermen recall a time when knowledge of tides, winds, and seasons was enough to make a living. Today, even experience cannot offset degraded ecosystems and unpredictable conditions.

The loss is not only economic. It is cultural. As fishing becomes less viable, traditions tied to food, language, and community risk fading with it.

An Uncertain Horizon

Tunisia’s fishermen are navigating a narrow passage between climate change and industrial pressure. Protecting their future will require more than enforcement alone. It will demand rebuilding marine ecosystems, supporting small scale adaptation, and recognising that artisanal fishing is not a problem to be replaced, but a solution worth preserving.

The sea still holds life. Whether it can continue to sustain those who have depended on it for generations depends on choices made now, before the tide turns further against them.

 

Sources and References

Arab Reporters for Investigative Journalism. Climate Change Deepens the Struggles of Tunisia’s Fishermen, as “Kys” Trawlers Boats Steal Their Livelihoods

Food and Agriculture Organization of the United Nations. Mediterranean fisheries assessments and Tunisia country profiles.

Intergovernmental Panel on Climate Change. Sixth Assessment Report. Mediterranean regional impacts.

Environmental Justice Foundation. Reports on bottom trawling and seafloor carbon release in Tunisia.

General Fisheries Commission for the Mediterranean. Technical regulations and Gulf of Gabès management measures.

UNEP Mediterranean Action Plan. Coastal ecosystems and climate vulnerability.

International Union for Conservation of Nature. Mediterranean biodiversity and Posidonia oceanica assessments.

Mongabay. Investigative reporting on illegal trawling and seagrass loss in the Gulf of Gabès.

Giacomo Abrusci, SEVENSEAS Media

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Conservation Photography

Running Wild: The Return of Patagonia National Park’s Rheas

The Chacabuco Valley stretched wide before us. The golden steppe was broken by winding rivers, framed by snow-capped ridges that seemed to glow in the fall sun. We were in the heart of Patagonia National Park, a place reborn from what used to be one of the largest sheep ranches in Chile. Old Estancias once carved the land into squares made of barbed wire and filled with overgrazed pastures. But today, those fences are gone. The grasslands pulse with guanacos again and the park has become a symbol of what rewilding can mean when it’s done right.

We’d come here to see a beacon of rewilding in the area, which took shape as an oddly familiar looking species of bird called the Darwin’s rhea (known locally as ñandú or choique.) It’s Patagonia’s strangest survivors, this flightless animal with legs built for speed and feathers streaked in soft browns that disappear into the grass. From a distance, they look almost prehistoric, like something you might imagine darting across the steppe in a bygone epoch. Up close, they’re ecosystem engineers, spreading seeds that shape grassland health, and feed predators such as pumas and foxes that depend on them for survival.

Brown and white Darwin's rhea standing behind wire fence at conservation holding facility with blurred background in Patagonia Chile
Patagonia National Park’s newest choique, or Darwin rhea bird. Photo Credit: Adam Moore

These birds possess an unusual way of fertilizing the land, making them critical players and worth a heavy invesment in their rewilding. Unlike guanacos, which use fixed latrines (skat dropping areas) that concentrate nutrients in one spot, rheas are wanderers in every sense. As they roam, they drop seeds across the steppe in a steady scatter, with each pile of droppings carried further by rodents like tuco-tucos that burrow and churn the soil. This gives plants a chance to take root in Patagonia’s harsh winds. It’s a less prominent, yet highly fundamental cycle where rheas eat, move, fertilize, and in doing so, stitch the landscape together. Without them, the steppe would grow weaker and far less resilient.

Aerial view of turquoise glacial river flowing through dramatic canyon with golden vegetation and mountains in Patagonia National Park Chile autumn landscape
Views of Patagonia National Park and the surrounding Aysén region. Photo Credit: Adam Moore

Rheas, standing about three feet tall, are designed to vanish into Patagonia’s grasslands rather than dominate them. Rheas move almost like ghosts, disappearing into the landscape until you realize the ground itself was alive and moving all along. And yet here, in what should be one of their strongholds, rheas had nearly vanished. 

Just a decade ago, a survey inside the park found fewer than 22 individuals left—a catastrophically low number for a bird so integral. The reasons were painfully manmade, as they often are when it comes to biodiversity loss like this. Decades of ranching, which ended here in 2008, had blanketed the valley in fences that trapped and killed rheas. Eggs were taken for food, chicks were chased down, and their range shrank until they were pushing just shy of a memory.

Single guanaco standing alert in golden grassland with snow-capped mountains and dramatic cloudy sky in Patagonia National Park Chile
A single guanaco in Patagonia National Park. Photo Credit: Adam Moore

That’s where Emiliana Retamal, a young veterinarian turned wildlife ranger, comes into the conversation. She’s part of a small team with Rewilding Chile trying to bring rheas back to the Chacabuco steppe. The first thing she said upon meeting was to slow our movements, talk less, and to follow her lead when approaching these flightless wonders. We were off to the holding pens that served as a temporary home for both rhea adults and chicks, known here as charitos. Some of them were getting ready to be released into the wild, marking another historic moment for the rewilding team.

The following morning was all about getting things right. Rewilding Chile’s rhea initiative, called Ñandú Conservation and Recovery Programme, has been running since 2014. Ever since, the team has been incubating eggs, raising chicks, slowly reintroducing birds into the wild, all building toward a goal of restoring a self-sustaining population of at least 100 adults and at least four actively reproducing.

Four conservation team members using cameras and binoculars to monitor Darwin's rheas in golden steppe grassland with blue sky in Patagonia National Park Chile
The ranger and veterinarian team monitoring rheas in the wild. Photo Credit: Adam Moore

For Emiliana, release days are equal parts research, nerves, and a ton of hope. Each bird is carefully prepared, including mandatory health checks, parasite treatments, and a period of acclimatization inside open-air pens where they gain strength and learn to fend for themselves. The idea is not to domesticate them in any way, but rather, give them just enough of a head start to survive top predators, and Patagonia’s harsh winters once the pen gates swing open. Some are fitted with GPS collars—the first of their kind for monitoring rheas here—allowing the team to track their survival rates and see if they’re reproducing in the wild.

We were fortunate enough to witness this particular relase, which was a true milestone. Alongside captive-born birds, a group of 15 rheas had been translocated from Argentina for the first time. These wild individuals were specifically brought in to bolster genetics. These bird groups act quite differently, with the wild ones moving as a tighter group and demonstrating discomfort around people. That’s exactly what Emiliana wants, as the goal is to ensure the animals remember what it means to be wild or remain entirely wild to up their chances of survival.

Young brown Darwin's rhea chick standing on one leg in grass with wire fence in background at conservation facility in Patagonia Chile
A small charito, or rhea chick. Photo Credit: Adam Moore

When the moment finally came, the puesto (or field station) buzzed with controlled urgency. Emiliana and her patchwork team of rangers, vets, community leaders, and allies, moved with practiced rhythm, coaxing these powerful, awkward-looking birds into small wooden crates. These rheas were not tame, so asking them to willingly go into confinement requires a patient and steady hand. Every movement was about safety—maximizing calmness while minimizing stress, and avoiding injury for all.

Outside, a convoy of trucks rumbled to life while drones circled high above, ready to follow the release. Autumn had painted the surrounding forests in fire-reds, yellows and oranges. The air carried the kind of crispness that warned of winter’s approach. Bundled in layers, we set off across the park along a road that wound through valleys where iconic mountains dominated the horizon. The landscape begged us to stop and stare, but the mission pushed us forward. When we reached the release site, the cages were lifted down and arranged side by side. The team stood in a nervous silence. Everything was ready, so the countdown began.

Three conservation rangers in outdoor gear chasing Darwin's rheas across dirt enclosure with mountains in background during wildlife handling operation in Patagonia
Rounding up the rheas for relocation is no easy feat. Photo Credit: Adam Moore

On the count of three, the gates opened and the wranglers stepped back fast. For a heartbeat, not a single bird moved. Then, with a rush of feathers and legs, the rheas spilled out into the open, scattering across the grasslands like wind made visible. Some lingered, hesitating at the threshold. Others bolted in tight groups, vanishing into the tawny steppe. It certainly was not graceful, but it was emotional nonetheless. A species that had nearly disappeared from this place was running free, once again.

Releases like this may look simple. Open the gates, let the birds run, right? But the reality is far from it. Rewilding is hard work, and with rheas, it’s closer to brutal. In the wild, more than half of chicks don’t survive their first year. Eggs are eaten by predators or trampled by livestock, chicks are picked off by foxes, eagles, and pumas, and even curiosity can be fatal. Young birds often die from mistaking the wrong thing for food, like rocks or other inedible objects. And on top of that, the male birds are sometimes left caring for 50 chicks at once, making survival that much harder. Add to that the genetic bottleneck of starting with so few individuals in the wild, and every single bird that makes it into adulthood feels like a victory against impossible odds.

Conservation team standing with wooden transport crates as Darwin's rheas emerge onto Patagonian steppe with snow-capped mountains in dramatic landscape background
The Edges of Earth Expedition was on site for the rhea release day. Photo Credit: Adam Moore

That’s why Emiliana and her team treat each rhea like an individual case study. Every release is followed by weeks of long days in the field monitoring and collecting data. Collars on individuals provide glimpses of survival, but much of the knowledge still comes from old-fashioned ranger work of tracking footprints across the steppe. Their job next will be to spot birds from a distance, asking local police and community members to report sightings to speed up the process.

And yet, for all the setbacks, the progress is undeniable for this team. From a ghost population of just 22 individuals to more than 70 now roaming the Chacabuco steppe, the recovery is indisputable. But numbers alone aren’t enough around here. Survival depends on genetics, and until recently, most of the birds released here had been hatched or raised in captivity. This means they were strong in body, but softer in instinct. This release however, was marking a turning point.

Large flock of Darwin's rheas running across golden Patagonian steppe grassland with dramatic cloudy sky and mountains in background Chile
Rhea group in the wild roaming Patagonia National Park. Photo Credit: Adam Moore

These 15 wild rheas translocated from Argentina to Puesto Ñandú—just a few kilometers from the border—arrived carrying what captive-bred birds could not: diverse DNA, sharper instincts, and that memory of how to live without the aid of humans. While borders divide people, they mean nothing to the animals who cross them freely. Rheas don’t recognize Chile or Argentina, but they recognize habitat. And if this recovery is to last, it will take both nations working together to protect the grasslands they share.

Even with the numbers trending upward, one of the biggest challenges is, of course, social. In nearby Cochrane, Emiliana is known casually as “the choique girl.” People are aware of the project, but they don’t always feel ownership of it. Many still see the park as something created by outsiders, disconnected from their lives. That gap is fundamental, and something the Rewilding Chile team, as well as its other collaborators including Quimán Reserve, CONAF (Chile’s National Forestry Corporation), SAG (Agriculture and Livestock Service) and Carabineros de Chile, are putting emphasis on. Rewilding efforts must be equally about saving species and building genuine relationships with communities or everything done in the field will not be effective.

Portrait of young female wildlife veterinarian Emiliana Retamal wearing Rewilding Chile cap standing by truck with mountains behind her in Patagonia
Emiliana Retamal getting ready to release rheas in Patagonia National Park. Photo Credit: Adam Moore

Being in attendance on that release day, standing in the steppe as the cages opened and rheas burst back into a landscape that once nearly lost them, was something that will never escape our memory. The pride on the team’s faces, the outward relief after months of preparation, the sight of those birds vanishing into the golden grasslands, all felt triumphant.

As Emiliana reminded us, this is only the beginning. In the vastness of Patagonia National Park, surrounded by snow-capped ridges and rivers that once ran through sheep pastures, the work ahead is as immense as the landscape itself. Watching rheas roam free again was proof that rewilding means to restore the past, in addition to defining a new future, where ecosystems can someday thrive without our intervention.


ABOUT THE AUTHOR

Andi Cross is an explorer, strategist, and extended range diver with Scuba Schools International and Scubapro, who leads Edges of Earth—a global expedition and consulting collective documenting resilience and climate solutions across the world’s most remote coastlines. Her work centers on “positive deviance”—spotlighting outliers succeeding against the odds—and using storytelling and strategy to help scale their impact.

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