Extinction often comes silently, without pomp or circumstance sometimes in less time than it takes to take a human breath.

The Center for Biological Diversity has petitioned the U.S. Fish and Wildlife Service to safeguard the Mule Mountains ...

The Center for Biological Diversity petitioned the U.S. Fish and Wildlife Service today to protect the Mule Mountains population of the Yarrow’s spiny lizard under the Endangered Species Act.

"They're not there," he said. "It seems like the species is now extinct." Yarrow's spiny lizards may be extinct in the Mule Mountains of Arizona after living there for 3 million years. / Credit: ...

Bisbee, located in the Mule Mountains between the San Pedro and Sulphur Springs valleys in southeastern Arizona, was Arizona’s premier mining camp by 1900 with its signature mine, the Copper Queen. It ...

A National Park Service worker had to be rescued after the mule he was riding bucked him off and injured him on a mountain in Saguro National Park. Pima County Sheriff's Department Search and Rescue A ...