The saguaro cactus towered over the hilltop outside Tucson like a massive hand rising out of the earth. Generations of hikers posed for pictures at the base of the hulking, treelike plant ...

A look at the history and life cycle of the Saguaro cactus. Did you know the mighty saguaro cactus came to the Sonoran Desert region after the last Ice Age, thousands of years ago? That’s just ...

Saguaro cactus, Saguaro National Park (Rincon Mountain District), Arizona. Image: SonoranDesertNPS/flickr/CC BY-2.0 6. Despite the spines, which prevent hungry animals from feasting on their tissues, ...