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The Janos Biosphere Reserve in western Chihuahua was the first federally protected area designated as such to protect grasslands, although about half of the reserve falls within the Sierra Madre Occidental, and is covered by oak, conifer and aspen forests. Its wildlife includes black-tailed prairie dogs, bison, kit fox...
The Sierra de en Medio is an isolated mountain range within the Janos Biosphere Reserve with a great potential for wildlife conservation. Parts of this area are being phased out from cattle grazing, recovering the vegetation and thus increasign the forrage for wildlife.