The saguaro and another cactus species (the cardón ... temperatures and interaction with bugs, animals and humans, thus creating issues when calculating age. Some species' age can also be calculated ...

Nearly 50 acres in the foothills of the Tucson Mountains have been added to Saguaro National Park, bringing its total footprint to over 92,000 acres. Why it matters: The national park outside Tucson ...

Saguaro cactus silhouetted at sunset in the Saguaro East - Rincon Mountain District, Saguaro National Park, Tucson, Arizona. (Photo by: Jon G. Fuller/VW Pics/Universal Images Group via Getty Images) ...

This 92,867-acre park is dedicated to the largest cactus in the U.S., the saguaro (pronounced sa-WAH-ro), a universal symbol of the American West. The park is divided into two districts ...