The sun rises over the Rincon Mountains east of Tucson, Arizona, beaming hues of orange, pink and purple into the sky....
Just miles from the site where the U.S. military detonated the first atomic bomb, scores of species entirely new to science...
In 2010, the Peregrine Fund reported that 72 percent of condors captured in Arizona had lead in their blood. Of this...
Emma steps out often but stays close to home. After almost drowning, Ward kept a low profile for 12 years. King...
It was mid-October, and it was still hot in the Sonoran Desert. The land was beyond parched. The creosote leaves looked...
About 300,000 years ago, during the last big Ice Age, a small red creature traversed the deep snow of what is...
Imagine a world without bats—a world overrun with biting insects, a world where plants that rely upon bat pollinators might disappear. ...
What Tree Rings Can Tell Us Dendrochronology (from dendron, meaning “tree limb,” and khronos, meaning “time”) can be used to date...
Tipi Rings Outline the Circle of Domestic Life One of the most ephemeral of archaeological artifacts, the tipi ring, or tent...
Solving the puzzle of dying curl-leaf mountain mahogany trees in Bighorn Canyon, Wyoming A battle for supremacy is raging on the...