A new round of genetic analysis has concluded that there is just one interbreeding bison population in Yellowstone National Park, not two genetically distinct populations.

Efforts to end the National Park Service's growing policy not to accept cash at sites in the National Park System have been revived with an amended complaint filed in federal court in Washington.

On the cusp of careers envisioned to last decades, fired National Park Service employees are left wondering about what might have been.

Mammoth Cave National Park in Kentucky celebrates the world’s longest known cave system at over 426 miles (686 km), home to unique wildlife (eyeless fish and transparent cave shrimp), unique history (saltpetre mining and TB huts), and unique geology (karst topography, speleothems, and fossil sharks).