Ukraine Released Water Buffalo Into An Abandoned Wetland — 5 Years Later, The Ecosystem Revived

Added: 2026-05-15

[00:00:16]Humans have destroyed up to 90% of Europe's wetlands for agriculture and industry. And when we realized the mistake, we began looking for ways to repair it. You would think they needed giant machines or billion-dollar projects, right? But no. In 2019, a strange barge moved along the Danube River. Its destination was a deserted island overgrown with vegetation located right beside a sensitive border zone where conflict is still taking place. On the deck, there were no excavators or bulldozers. There were only scientists and seven water buffalo.

[00:00:53]Their mission was to restore the entire dead ecosystem here. Isolated, few in number, and without any support. This plan was mocked by many people as unrealistic.

[00:01:04]But 5 years later, those seven animals created a result no one had expected.

[00:01:09]Let us see how they did it.

[00:01:13]The Danube Delta is the second largest pristine delta in Europe, stretching across the territories of Romania and Ukraine with an area of more than 1,600 square miles. It was once a vital stopover for millions of migratory birds and a natural nursery for countless freshwater fish species. However, 90% of wetland areas across the European continent have been destroyed by industrialization and agriculture. The Danube Delta is no exception. Located right in the heart of this delta is island, a strip of land covering 13.5 square miles, equivalent to the area of a small city. During the Soviet period, this island was surrounded by a solid system of dikes. Humans drained the water to convert this wetland into agricultural fields. They completely broke the river's natural flooding rhythm that had existed for thousands of years. But farming on wetland soil was a mistake. When productivity declined severely, humans left and abandoned the island. Many people believe that as long as humans withdraw, nature will recover by itself and return to balance.

[00:02:17]Scientific reality proves the opposite.

[00:02:20]Hermacov Island did not revive. It fell into a terrifying ecological trap called Reed invasion. With no large herbivores left to control them, reeds grew at an uncontrollable speed. They reached up to 4 m high, producing 9 to 13 tons of biomass per acre each year. This layer of vegetation intertwined into a giant biological wall, blocking 95% of the sunlight from reaching the water surface. The consequences happened immediately.

[00:02:49]Aquatic plants below withered because there was no light for photosynthesis.

[00:02:53]When old reeds died and sank down to decompose, this process drained dissolved oxygen in the water to below 2 mg per liter, the survival limit for most aquatic organisms. Fish disappeared. Aquatic insects lost 30 to 70% of their biomass.

[00:03:10]When the bottom food chain collapsed, waiting birds had no reason left to stop there. The biodiversity of Hermac of Island declined to its lowest level. At this point, the ecosystem was like a broken cycle. It did not lack water and it did not lack soil. What it lacked was natural disturbance, a force strong enough to constantly break down the reed walls, opening space for light and air.

[00:03:34]Humans had to intervene, but this time not with excavators.

[00:03:38]They decided to use nature itself to restore nature.

[00:03:43]In May 2019, Reing Europe and Reing Ukraine decided to carry out a one-of-a-kind campaign. A barge carrying scientists, rangers, and seven water buffalo quietly moved along the Danube River to enter island. Why water buffalo and not industrial mowing machines? Science calls water buffalo ecosystem engineers.

[00:04:05]While domestic cattle only eat soft grass on dry surfaces, water buffalo are animals with superior restoration power in wetlands. Their biology is built to handle tough vegetation, including young reed shoots growing beneath the mud. The origin of these seven buffalo is also a dramatic historical story. Europe once had a native buffalo species, but it went extinct during the ice age. The buffalo entering island are descendants of Asian water buffalo which had lived for thousands of years in the Carpathian Mountains. During the period of agricultural collectivization because they did not fit the closed industrial livestock model. These buffalo were removed on a mass scale and pushed to the edge of total extinction.

[00:04:48]The person who saved these creatures was Michelle Jacobe, a German conservationist. He spent 10 continuous years gathering every remaining buffalo he could find in remote rural areas, raising them and protecting their genetic line. The journey of more than 1,000 kilometers, bringing seven buffalo from safe farms in western Ukraine straight into a deserted island with no barns and no supplementary food was a risky challenge. When the barge reached the shore, these animals did not hesitate to step down. Thousands of years of instinct immediately awakened. They charged straight into the swamps, plunged through the mud, and began chewing the dense reed shoots. The reing plan was officially activated without needing human operators without burning a single drop of fossil fuel.

[00:05:39]The seven buffalo began changing the geological and biological structure of the 13.5 square mile island. Their operating mechanism was more sophisticated than any artificial system humans had ever created. First is their enormous consumption capacity. A water buffalo weighing 400 kg can consume 25 to 40 kg of fresh plant biomass each day. With only the original herd, they processed hundreds of tons of reeds every year. Unlike the total plowing method of machines, this animal consumes vegetation randomly, thereby establishing a diverse vegetation structure. In the middle of a uniform sea of reeds, patches of short grass, exposed mudpools, and shallow channels now appeared. Sunlight could finally reach the bottom of the water. Second is their skill in creating microhabitats.

[00:06:27]Water buffalo do not have well-developed sweat glands, so they must roll in mud to cool their bodies and remove parasites. By trampling and rolling around, a herd of buffalo can create dozens of mud pools, each one covering from 10 to 45 m. In the dry season, when the river level drops, these mudpools retain warm water, becoming perfect nurseries for insect larae, amphibians, and small fish species. Third is their ability to transport life.

[00:06:57]On average, each buffalo leaves behind about 15 to 25 kg of dung every day across the entire island. This is a huge source of organic fertilizer, directly providing nutrients for the soil microbiome. At the same time, through their thick fur and digestive system, water buffalo carry and spread the seeds of more than 200 different plant species across the island. Wherever the buffalo pass, new plants grow. Within only 1 to 3 years, satellite data returned numbers that stunned scientists. In areas where the buffalo herd was present, reed cover dropped from 100% to a safe level of 50 to 70%.

[00:07:36]Insect density surged by 70%. The density of small fish breeding in shallow water doubled. And when fish appeared, top aerial predators began gathering here. Great white pelicans, glossy ebises, and white-tailed eagles arrived in large numbers, turning back into one of Europe's most vibrant biodiversity hotspots.

[00:07:59]While the ecosystem was on the path to recovery, in 2022, geopolitical conflict broke out. The Danub Delta area lies in an extremely sensitive border zone.

[00:08:10]Research activities were interrupted and the conservation team faced serious security risks. Ecological tragedy struck in 2023 when the Kakovka hydroelectric dam in southern Ukraine was destroyed, releasing billions of cubic meters of water and toxic substances into the environment. The incident was internationally assessed as an ecologically destructive disaster, permanently destroying many nearby wetlands. But amid that brutal context, Emacov Island still stood firm and continued to expand in scale. The biodiversity brought by the buffalo herd created a natural resistance for the island. The project did not stop with water buffalo. It continued adding other animal species into the system. They released dozens of wild conic horses, red deer, seeika deer, and even eagle owls onto the island. This strategy was inspired by the NEP conservation model in the United Kingdom. Building a tightly connected biological chain.

[00:09:06]Conic horses specialize in trimming short grasses while water buffalo clean up the flooded reads. Their coordination solves one of the greatest risks caused by climate change wildfires. In summer, when temperatures rise, dried reed fields turn into extremely flammable material sources. With only one small spark, fire could burn the entire island to the ground. But thanks to herds of grazing animals continuously consuming this layer of dry biomass, wildfire risk is reduced to the minimum. More importantly, the latest scientific data from the project points to a shocking truth. According to international environmental reports, wetlands inhabited by herbivores have an underground carbon storage capacity no less effective than tropical forests. By chewing grass and disturbing the soil, water buffalo are directly storing greenhouse gases underground, turning the island into a giant carbon storage basin. Global scientists are watching this phenomenon very closely. What is happening on Hermacov is compared to a wetland version of the event in which wolves change the flow of rivers in Yellowstone National Park. When the right missing piece is placed into an ecosystem, the entire biological domino chain automatically rearranges itself.

[00:10:22]From the original small group of seven buffalo, the herd has reproduced naturally to more than 18 individuals.

[00:10:28]In May 2024, the project confidently transported six more female buffalo by barge to the island to expand the gene pool. Grazing density is still controlled at a perfect level, ensuring that the ecosystem is not overexploited.

[00:10:44]The story of Hermacov Island does not stop at dry scientific indicators.

[00:10:49]It has created an impact beyond every calculation made by conservationists.

[00:10:53]Starting in 2025, Reing Ukraine partnered with medical councils to launch the nature for veterans campaign. This project carries a pioneering mission using the recovery of nature to improve human mental health. Only about 80 km from the island is Odessa, where the marks of conflict are still unfolding.

[00:11:14]Veterans returning from the front lines carry deep psychological wounds. They are taken onto boats traveling into the core of the Danube Delta to witness herov island with their own eyes. This method is based on the scientific foundation of ecootherapy, similar to models being applied in Japan and North America, but carried out on a much broader scale. When soldiers see a land that was once severely degraded, now filled with life, with water buffalo soaking in the mud, eagles circling above, and fish flicking their tails underwater, they see a ray of hope.

[00:11:47]Nature proves that no destruction is permanent. If a dead island can revive powerfully, then human beings and even an entire nation can also recover from tragedy. Veterans do not only come to look, they directly take part in building artificial nests for pelicans, supporting conservation work, and finding peace in their souls amid the wild rhythm of nature. This contrast creates a powerful message. While out there, humans are using steel machines to create conflict. On this island, they are learning how to cooperate with the gentlest creatures to sew life again.

[00:12:24]The transformation of Emacov Island over the past 5 years is the clearest proof of a new conservation principle. We cannot save nature by freezing it inside glass cages, and we do not need to spend billions of dollars intervening with machines. The success at is now becoming a standard model for conservation projects in Western Europe and North America in the strategy of restoring marshland ecosystems. With only seven water buffalo, a move considered unrealistic and doubted in 2019.

[00:12:54]Europe has found a blueprint for reviving millions of acres of wetlands worldwide. Everything works through a tight logical chain. Water returns.

[00:13:02]Water buffalo clear the path. Sunlight shines down. Microorganisms awaken and life explodes. For thousands of years, humanity has always taken pride in its ability to conquer and reshape nature.

[00:13:15]We build dikes to block rivers. We clear forests for fields.

[00:13:20]And we use machines to impose our will on the earth. However, modern scientific trends are proving a new principle. The most sustainable solution is not to impose technology on the environment, but to restore biological links. So nature can operate by itself. And you, what do you think about this rewing method? Is releasing animals freely to reshape the environment the future of conservation around the world? Or will economic and agricultural pressures soon crush these efforts? Leave your opinion in the comments section below. Do not forget to hit the subscribe button so you do not miss real life stories about how the natural world is operating and healing itself every day.