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The Beach Mountains are a small extension of the Trans-Pecos Central Range in Culberson County, and like so many of the desert ranges of western Texas, almost nothing is known of the resident mammalian fauna. At least 35 species are herein documented to occur in the Beach Mountains, including a successfully transplanted stock of desert bighorn (Ovis canadensis), which occupies this last known stronghold of the extirpated native herd. Desert scrub species predominate locally, but grasslands species also are well represented. Noteworthy records include an unusually high population of Ammospermophilus interpres, and an apparently isolated group of Chaetodipus nelsoni, which provides the northernmost record for the species in the Trans-Pecos, and evidence of the continuing northern expansion in western Texas of the javelina (Tayassu tajacu).