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Living in the Mojave and Sonoran Deserts of the southwestern US, desert tortoises live about 50 to 80 years. They grow slowly and have low reproductive rates. They spend about 95 % of their time in burrows to keep cool in the summer and warm in the winter. Some desert tortoise populations have declined by as much as 90% since 1980s. Threatened, it is unlawful to touch, harm, harass or collect wild desert tortoises.