Mojave ...As well as the Sonora desert. Theses deserts stretch from the southern tip of Nevada, Southern California, parts of Arizona, all the way into Mexico.
Of Course! They are not just called Desert Tortoises for nothing!
That is the habitat they have adapted to.
because that is the way that they were born the have adapted to that way of life
Many desert animals live underground, or spend most of the day in the shade of a rock or plant.