Invasive Mouflon Sheep in Teide National Park: A Growing Ecological Crisis 2026

Invasive mouflon sheep in Teide National Park have become a serious ecological problem since their introduction in 1971. What started as a hunting initiative with just 11 animals has exploded into a population that now threatens the park's unique biodiversity.

How the Mouflon Sheep Arrived in Teide National Park

In 1971, the Spanish government, supported by hunters, introduced European mouflon (Ovis orientalis musimon) to the Canary Islands for big-game hunting. The species, native to Corsica and Sardinia, was released in Teide National Park on Tenerife. According to the Association for the Conservation of Canary Biodiversity (ACBC), this decision was made without considering the long-term consequences for the island's fragile ecosystem.

Islands have limited resources and a unique inventory of biodiversity compared to continents. The introduction of a non-native species like the mouflon was a risky experiment that has now spiraled out of control.

The Current Situation: A Population Out of Control

Today, the mouflon is considered an invasive species in the Canary Islands. It occupies the highlands of Tenerife between 1,400 and 3,100 meters in altitude. With no natural predators on the island, the population has grown unchecked. According to the Tenerife Island Council (Cabildo de Tenerife), the sheep roam freely, trampling and devouring native vegetation.

Jaime Coello, director of the Telesforo Bravo Foundation, an NGO dedicated to preserving and studying the legacy of the researcher, states: "There must be many more than 500 animals, because they are seen near inhabited areas and in Corona Forestal zones where they were not thought to be." This estimate far exceeds previous counts, indicating a rapid expansion.

Moreover, in La Palma, hybrids with domestic sheep have been documented, raising further concerns about genetic pollution.

Why the Mouflon Sheep Is a Threat to the Ecosystem

The mouflon's impact on Teide National Park is profound. By trampling and consuming endemic plant species, the sheep disrupt the delicate balance of the ecosystem. Many of these plants are unique to the Canary Islands and are already vulnerable.

The presence of mouflon also affects soil stability, as their grazing and movement can lead to erosion. This is particularly damaging in the high-altitude areas where vegetation is sparse and slow to regenerate.

• Habitat destruction: Mouflon sheep trample and eat native plants, some of which are endangered.
• Competition with native species: They compete for food with endemic herbivores, though few exist.
• Soil erosion: Their movement destabilizes soil, especially on slopes.
• Genetic pollution: Hybridization with domestic sheep has been recorded in La Palma.
• Spread beyond protected areas: The sheep are now seen near human settlements and in forest zones.

What Is Being Done to Control the Invasive Mouflon?

Authorities face a complex challenge. Controlling an invasive species in a national park requires careful planning and often controversial measures. The Tenerife Island Council has acknowledged the problem, but eradication is difficult.

Some strategies include controlled hunting and population monitoring. However, these efforts are hampered by the rugged terrain and the sheer number of animals. Conservation groups like the Telesforo Bravo Foundation advocate for more aggressive action to protect the park's biodiversity. The background to this story is set out in Invasive Species Cost Australia $24.5B: How to Respond. A related thread runs through Invasive Species Cost Australia Billions: How to Respond. Earlier coverage in Energy Utilities: latest articles shows how the argument developed.

Comparison of Mouflon Impact in Different Regions

What to Watch Next

The situation in Teide National Park is a cautionary tale about the unintended consequences of introducing species for hunting. As the mouflon population continues to grow, the pressure on native flora and fauna will intensify. A closer look at the same subject appears in Canary Islands Pay the Hidden Cost of Fishmeal Aquaculture. Anyone following the wider picture can start with Ocean Thermal Energy: Canary Islands Project Tests 24/7 Power. The same theme surfaces in Invasive Pheasants Now Dominate Argentina's Victoria Island Forests, which takes a different angle.

Monitoring and research are crucial. The Telesforo Bravo Foundation and other organizations are calling for updated population counts and a comprehensive management plan. Without decisive action, the unique biodiversity of Teide could suffer irreversible damage. Context on how this played out before sits in Sheep Shearing Crisis: UK Visa Policy Causes Needless Suffering. A companion piece, Invasive Mouflon Sheep in Teide National Park: A Growing Ecological Crisis, approaches the same subject from another angle.