Scientist finds Jeffrey pine trees at record mountain heights, suggesting climate-driven shifts in Sierra Nevada.

A UC Davis professor's pleasure hike in the High Sierra turned into a new elevation record for California's highest tree, the ...

A professor's casual hike in the High Sierra turned into a new elevation record for California ... pine trees, preliminary evidence suggests the bird carries fleshy Jeffrey pine seeds up the ...

Photographer Mitch Epstein's years-long project highlights the majesty and vulnerability of old growth forests across the US ...

California wolves are on the comeback. And no matter how hard wildlife officials try to direct them toward their natural prey ...

Plans for a summer youth recreation program similar to that conducted here the past three years were formulated Thursday ...

From May through November, Amtrak’s Trails & Rails Program ensures National Park Service volunteer guides join the ride ...