JT Thomas It's a relentlessly sunny day in the Rocky Mountains, and here at 9,000 feet, on the Grand Mesa in western Colorado, the aspen trees should be casting a shadow. But something is wrong in ...

It appeared that the aspen trees had stopped regenerating around ... It would appear that Yellowstone needs its top dog to keep elk on the run and its vital plant and animal diversity intact.

Young aspens often don't survive because of factors such as grazing elk, according to a study by Northern Arizona University researchers.

Admirers frequently note the striking white bark of quaking aspen. This bark lives and carries out photosynthesis, attributes that make it unique among North American trees and likely contribute ...