Two endangered Mexican gray wolves were released in the Peloncillo Mountains of southern Arizona as ... would become the first pack to roam Arizona's Sky Islands in decades and the southernmost ...

Much of its 184-mile length in southern Arizona — with an elbow ... the cultural and ecological heavy lifting it does for the Sky Islands region. From the air, stretches of the riverbed look ...

Various species of talus snail species are likewise limited to a single mountain range, Arizona’s Santa Rita Mountains. Such species are particularly vulnerable to threats like large-scale resource ...