Each side of Saguaro National Park offers a visitor center with restrooms and watering stations. Visitors will find maps, ...

As the trail wound its way into Arizona's Sky Islands, the region's biodiversity was on full display, as were the threats ...

Saguaro Park in southeastern Arizona, near Tucson, offers a landscape unlike anything you’ll see elsewhere. The park hosts ...

When you think of Saguaro National Park — sprawling mountain reserves on the east and west ends of Tucson — you may think of cactus. But probably not orchids. However, the Thurber’s bog orchid is one ...

Facing terminal cancer, retired veterinarian Maggie Wagner went looking for a legacy. She found it in a garden of succulents and cactus.

By analyzing the natural vibrations of a saguaro, scientists can study the cactus's insides without cutting them open.

The saguaro cactus is engineered for endurance in one of North America’s toughest environments. Rising up to 70 feet tall, with arms reaching skyward like desert sculptures, the cactus endures searing ...

Wild burros' appetite for native desert trees are endangering the health of Sonoran ecosystems, a new study found. By damaging cactuses and other vegetation, the burros also put themselves at risk, ...

Justin Stewart, an ecologist with the Society for the Protection of Underground Networks, collects a sample of soil containing mycorrhizal fungi taken at Saguaro National Park. Credit: Wyatt ...

Tanisha Tucker Lohse, of the Tohono Oʼodham Nation, picks a ripe saguaro cactus fruit during a harvest day in Saguaro National Park near Tucson, Arizona, this June. Credit: Ross D. Franklin/AP Photo ...