The federal government will designate more than 10,000 acres in Arizona and New Mexico as prime habitat for the threatened Chiricahua leopard frog. More than a dozen streams and many livestock ...

A batch of 1,000 rare tadpoles raised at the Phoenix Zoo landed in a new home at the Grasshopper Tank in the Tonto National Forest, part of ongoing efforts to boost the population of the threatened ...

TUCSON, Ariz.— Cattle have caused immense damage to critical habitat designated to help threatened Chiricahua leopard frogs recover throughout four national forests in Arizona, based on field surveys ...

Northern leopard frogs are rapidly disappearing in the Northwest. Biologists hope this effort will help the population in Washington. Hundreds of endangered northern leopard frogs have hopped into the ...

Washington wildlife managers released hundreds of endangered northern leopard frogs into Washington’s channeled scablands Tuesday evening. About a dozen of those frogs were outfitted with small radio ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. FLAGSTAFF, Ariz. (AP) — A rare frog has been ...

Herds of bison graze on the North Rim of Grand Canyon National Park, endemic fossil spring snails cling to rocks found only in streams in parts of the Coconino National Forest, and bald eagles spread ...

Long blue tanks sit in a cinderblock building near the employee-only entrance of the Phoenix Zoo. Water percolating in the tanks echoes softly through the room. They appear to be empty until — ...