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Bison Roam Free: 160-Year Absence Ends in Mexico
24 Aug
Summary
- American bison reintroduced to Coahuila, Mexico after 160 years.
- Bison act as 'ecosystem engineers' regenerating desert habitats.
- Effort aims to restore ecological balance and biodiversity.
American bison have made a historic return to Coahuila, Mexico, after an absence of approximately 160 years. Nearly 50 bison were reintroduced in August and November 2025 into the Cuatro Ciénegas reserve, a UNESCO-recognized area within the Chihuahuan Desert.
Spearheaded by the Fundación Pro Cuatro Ciénegas, this initiative aims to heal a degraded ecosystem. Once a cattle ranch, the reserve is now being revitalized by the bison, which are considered 'biological tools.' Their grazing, trampling, and nutrient-rich dung are actively regenerating grasslands, improving water infiltration, and enriching the soil.
The bison's return is part of a broader continental movement focused on restoring keystone species. This effort in Mexico also includes projects like the reintroduction of Mexican wolves and Sonoran pronghorn, all contributing to restoring the natural balance and biodiversity of vital habitats across North America.
