Pyrenees Brown Bear Population Climbs to an Estimated 130 in Latest Census

Why It Matters

A growing, genetically constrained bear population threatens long‑term viability and could increase human‑wildlife conflicts, making urgent genetic rescue essential for ecosystem balance and regional tourism economies.

Key Takeaways

• Population reached ~130 bears, 11% annual growth
• 85‑90% descend from three individuals, raising inbreeding risk
• 2025 cub births fell to eight, inbreeding 20‑28%
• 41% of bears in France; 30% cross borders
• Proposal: add 30 bears by 2040 for genetic health

Pulse Analysis

The Pyrenees bear resurgence is a rare conservation win in Europe, showcasing how targeted reintroductions and habitat protection can reverse near‑extinction. From a nadir of five animals in the 1990s, the subpopulation now numbers about 130, driven by an 11 % yearly increase. Yet the success masks a genetic bottleneck: three founders dominate the gene pool, inflating consanguinity and reducing reproductive output. This paradox underscores that population size alone does not guarantee species resilience.

Genetic health is the next frontier for Pyrenean bears. Inbreeding coefficients of 20‑28 %—comparable to first‑cousin unions—have already manifested in a steep decline in cub births, from 24 in 2024 to just eight in 2025. Such levels can depress fertility, increase disease susceptibility, and ultimately erode the population’s adaptive capacity. Conservationists therefore advocate a genetic rescue strategy, mirroring successful programs in the Italian Apennines and the U.S. Yellowstone, by introducing unrelated individuals to broaden the gene pool and restore heterozygosity.

Policy responses must be transnational, given that 30 % of bears traverse the France‑Spain‑Andorra borders. Coordinated monitoring, compensation for livestock and beehive losses—approximately $14,420 and $3,940 respectively in 2025—and a clear plan to release 30 genetically diverse bears by 2040 are critical. Balancing ecological integrity with local livelihoods will determine whether the Pyrenees can sustain a thriving, genetically robust bear population for decades to come.