Desert tortoises have lived in the deserts of California, Arizona, Nevada and Utah since the Pleistocene. In the early years of the 20th century, they still thrived within the Southwest's arid landscapes: As many as 1,000 tortoises per square mile once inhabited the Mojave. But by the end of last century, this population of the desert tortoise was listed as a threatened species under the Endangered Species Act. Livestock grazing and urban development, along with the ever-increasing use of off-road vehicles, continue to degrade the tortoise's vanishing habitat, while Army translocation projects threaten to devastate the Mojave population.

It's important to note that desert tortoises in California and the Southwest are two separate species. In a 2011 study, scientists declared that tortoises living north and west of the Colorado River — the Mojave population now called Agassiz's desert tortoises, or Gopherus agassizii — are officially a different species from tortoises in Arizona and Mexico, previously called "the Sonoran population of desert tortoises" and newly dubbed Morafka's desert tortoises, or Gopherus morafkai. That study showed each desert tortoise species to be even rarer than previously thought.


The Center has been working for the Mojave desert tortoise since 1997. Challenging the Bureau of Land Management's grazing practices on arid public lands, we've helped protect millions of acres of fragile tortoise habitat. We've actively sought to limit off-road vehicle use throughout the desert tortoise's range, including appealing the opening of two illegal off-road vehicle routes in Kern County, California. In 2000 we made significant gains for the desert tortoise when, as a result of our legal efforts, the Bureau permanently cancelled all livestock grazing on 276,125 acres of the Granite Mountains Grazing Allotment. In 2002 we and allies won another landmark settlement in which 1.9 million acres of the California Desert Conservation Area were protected against livestock grazing and 18,000 acres of tortoise habitat were closed to off-road vehicle access.

Since then we've been fighting to protect desert tortoises and their habitat from development, off-road vehicles, oil and gas development, grazing, disastrous relocation projects, and much more. We won't let these ancient reptiles go the way of the dinosaurs.

Check our our press releases to learn more about the Center's actions for desert tortoises.

Photo © Robin Silver