What the literature says:

• “occurs on less than 15% of its original range” (Germano and Williams 2005)
• “probably lost 80-85% of its native range” (Germano and Williams 1992)
• “has been eliminated from 94% of its original range due to habitat loss primarily from agriculture, water development projects, and urbanization; but also from livestock grazing, mineral development, and off-road vehicle use” (Jennings 1995)