Wild boar numbers in Catalonia have doubled since the early 2000s, with the population now estimated at around 200,000 animals.
According to the latest data from the Programme for Monitoring Wild Boar Populations in Catalonia, density has reached 6.4 animals per square kilometre, nearly double the 3.5 per km² recorded a quarter-century ago.
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This significant increase has placed the region’s wild boar population under intense scrutiny, particularly following recent detections of African Swine Fever in Collserola.
Wild Boar Management Becomes Critical Priority
Experts describe the current wild boar density as “excessive” and stress the urgent need for continued population control strategies. Several factors have driven this population explosion. Carles Conejero, a wildlife veterinarian and researcher at the Autonomous University of Barcelona, explains that agricultural changes over the past forty years have created ideal habitats. “When traditional single-crop farms were abandoned, they gave way to young, unmanaged forests full of undergrowth where animals can hide and live without danger,” he states.
Furthermore, wild boars possess the highest reproductive rate among ungulates in the region. Females can reproduce upon reaching 30kg, typically bearing three to six piglets per litter. In urban areas, however, this weight threshold is reached by just six months of age, accelerating reproduction cycles dramatically. The availability of easily accessible food in urban environments, from rubbish to pet food left for other animals, exacerbates this issue. Consequently, managing this population has become a complex urban and rural challenge.
Another concerning factor is hybridisation with Asian pig species, particularly following a trend for keeping Vietnamese pot-bellied pigs as pets around 2010. These hybrids can produce significantly larger litters, with Conejero’s team documenting one hybrid sow weighing 130kg carrying thirteen piglets. Experts emphasise the need to capture these hybrids quickly to prevent them from breeding with native wild boars.
Significant Damage and Regional Density Variations
The economic and agricultural impact is substantial. Wild boars are responsible for nearly half of all animal-related damage in Catalonia. During the 24-25 season, they were behind over a thousand official damage reports, far exceeding the 238 incidents attributed to rabbits. The animals’ movement patterns are also noteworthy. Male boars are known to disperse widely, with some individuals travelling over 600 kilometres, causing population densities to fluctuate between regions annually.
Currently, the highest densities are not found in Barcelona’s immediate vicinity. The Alt Empordà region records 14.7 boars per km², while the Guilleries-Savassona natural area has 12.6 per km². Meanwhile, the Montnegre-Corredor and Montseny observatories report densities of 9.2 and 9.1 respectively. In contrast, the lowest densities of 2.7 per km² are found in the Cadí and Boumort observatories. These variations are often linked to local ecosystems and food availability, such as acorn production from oak trees, which follows a cyclical boom every four years.
Control efforts have intensified. Last year, 68,694 wild boars were captured across Catalonia. In Barcelona, a concerted strategy has yielded results. The creation of the Wild Boar Working Group two years ago led to 98 specific actions, including forest clearance, securing rubbish bins, and reducing vegetation in parks. “In Barcelona, we have reduced wild boar incidents by 70% over the last two years. It’s a clear indicator of success,” says Conejero. This urban strategy mirrors broader efforts to make environments less attractive to the animals, a challenge also seen in managing other aspects of the city’s green spaces, as seen in initiatives like the award-winning Eixample superblocks project.
Looking ahead, the debate continues on the most effective long-term management tools. While culling remains a primary method, some question its efficiency as a management, rather than recreational, tool. Alternative methods like contraceptive vaccines have been considered but are deemed logistically unviable for open environments like Collserola, where capturing 70% of fertile females would be required. The situation underscores a broader tension between urban expansion and wildlife management, a theme familiar in a city where balancing development with quality of life is a constant challenge. The future of Catalonia’s wild boar population, therefore, hinges on sustained, science-led management that addresses both ecological balance and human coexistence.
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