A popular pet tortoise, Russian tortoises are one of the most readily available tortoise species. They are small, making them easy for most people with limited space to keep. They are also feisty, eager to eat and more active than some other tortoises. When allowed to burrow, Russian tortoises also have one of the highest tolerances for temperature extremes. They are one of the few species that can be kept outdoors in Las Vegas, Nev., year round. These factors make Russian tortoises attractive for new tortoisekeepers and a fun tortoise for seasoned veterans.