In northern Mexico’s Chihuahuan Desert, the reintroduction of nearly 50 bison into the Cuatrociénegas nature reserve is beginning to restore the balance of a fragile ecosystem. This federally protected 84,000-hectare area, located in Coahuila state, is renowned for its striking gypsum dunes and vibrant blue pools, hosting hundreds of species, many of which are classified as critically vulnerable or endangered by UNESCO.
The bison were reintroduced last year as part of a conservation project centered in El Santuario, a 4,000-hectare section of the reserve. This initiative, led by Fundación Pro Cuatrociénegas in partnership with Coahuila’s Museo del Desierto, aims to revive the ecological dynamics that had been disrupted since the species’ disappearance in the 19th century due to human activities.
Reviving a Key Species to Restore Ecosystem Health
Gerardo Ruiz Smith, director of Fundación Pro Cuatrociénegas, emphasizes the ecological significance of the bison’s return, describing it as a step toward “reactivating the dynamics and the health of an ecosystem.” The initial reintroduction began in August 2025, with three bison released into El Santuario. By November, the population had grown to nearly 50 individuals, signaling rapid progress in the restoration effort.
The presence of these large herbivores, which had been absent for over a century, is already showing positive effects on the environment. Ruiz Smith expressed optimism about the project’s outcomes, noting that reintroducing a fundamental species that historically inhabited the region offers renewed hope for the reserve’s biodiversity and ecological balance.