DistributionRead full entry
New Distribution due to new taxonomyIn 2011 the Desert Tortoise was recognized to actually be two species, Gopherus morafkai and Gopherus agassizii. The two species apparently do not overlap in range and are divided by the Colorado River.
Gopherus agassizii ranges northwest of the Colorado River, in California and Nevada.
It's sister species lives southeast of the Colorado River, in Arizona and Mexico.