Rare tortoise stolen from Colorado zoo?

(CBS/AP) COLORADO SPRINGS, Colo. - Authorities think a rare 13-year-old tortoise may have been stolen from a zoo in Colorado Springs.

Officials at the Cheyenne Mountain Zoo say they last saw 13-year-old Butti on Monday afternoon in a hands-on exhibit where visitors can touch the creature, and his brother Tutti.

Officials say someone might have walked off with the Indian Star tortoise - he's the size of a grapefruit and weighs about a pound.

The Colorado Springs Gazette reported Tuesday that zookeepers are most concerned about the reptile's health because he requires a special diet of certain vegetables.

Indian Star tortoises typically live 10 to 15 years, and Butti has a history of respiratory infections, so the zoo is eager for Butti to be reunited with his keepers.