The two most docile and easiest to handle species are the Argentine Black and White Tegu and the Red Tegu. Additionally, a new variety has been recently introduced, called the Blue tegu due to the tendency of males to become bright blue upon maturity. These variations grow from just under 2 feet to a larger 4+ feet (gold and blue tegus being the smallest and the red and Argentine black and white being the largest) and have a pleasant nature, making them popular pets. Tegus are also recognized for their intelligence, and have an impressive ability to remember details.