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In a significant step towards ecological restoration, nearly 50 bison were reintroduced last year to Cuatrociénegas, a federally protected nature reserve nestled within the Chihuahuan Desert in northern Mexico. This 84,000-hectare area in the state of Coahuila boasts unique gypsum dunes and vibrant blue pools, serving as a sanctuary for hundreds of plant and animal species, some of which are listed as critically vulnerable or endangered by UNESCO.
The reintroduction effort focuses on a 4,000-hectare segment of the reserve known as El Santuario, where conservation activities are spearheaded by the Fundación Pro Cuatrociénegas. According to the foundation’s director, Gerardo Ruiz Smith, bringing back the bison is vital to “reactivating the dynamics and the health of an ecosystem” that had lost this keystone species over a century ago.
Restoring a Lost Keystone Species
The bison had been eradicated from the region during the 19th century due to human impact, but their return began in August 2025 when three individuals were first introduced to El Santuario. This initial release was a collaborative project between the Fundación Pro Cuatrociénegas and Coahuila’s Museo del Desierto. By November, the number of bison in the reserve had expanded, reaching a total of 47 animals.
Ruiz Smith highlighted the profound ecological significance of the bison’s comeback, describing it as “offering so much hope” by reinstating a species that “was there before and should be there.” The presence of these large herbivores is expected to stimulate a chain of beneficial effects within the ecosystem, contributing to its long-term restoration and resilience.
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