The Nature of Hanging Valleys

A hanging valley is generally defined as a stream or glacial valley that ends abruptly atop the steep wall of a deeper valley or sea cliff. ...

The Gila River

Covering more than 58,000 square miles, the watershed of the Gila River includes most of Arizona south of the Mogollon Rim.  The river itsel...

Pioneers of Enlightenment

On this annual American holiday of Thanksgiving, we stop to ponder our good fortune (however meager or extravagant that might be) and to tha...

Raptors in the Cold Sunshine

Clear skies and cold air enticed me down to the wooded hills and open farmlands south and east of Columbia this morning.  Besides, a steady ...

Refuge Closed for Killing

On this cold, gray, November morning in central Missouri, I headed down to Eagle Bluffs Conservation Area on the Missouri River floodplain, ...

The Great Appalachian Valley

The Great Appalachian Valley of North America, a series of topographic valleys separated by low divides, stretches for more than 1200 miles,...

Two Cities, Two Owls

Great horned owls are the nocturnal avian predators along the Colorado Front Range, feasting on prey as large as skunks, geese and raccoons....