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 ...

Visitors can see incredible saguaro cacti, as well as prickly pears, ocotillos, teddy bear chollas, and buckhorn chollas. Tourists should watch closely at dawn and dusk for animals like cactus ...

Saguaro cactus silhouetted at sunset in the Saguaro East - Rincon Mountain District, Saguaro National Park, Tucson, Arizona. ...