Scientists, arborists and foresters hope to bring the trees back someday, with a combination of smart crossbreeding, diligent ...

Mountain pine beetle has a one-year life cycle in Colorado. In summer, adults leave the dead, yellow- to red-needled trees in which they developed. In general, females seek out large-diameter ...

All species on Earth, both living and extinct, are related. We know this because of a biological tool called the tree of life. This "tree" takes the form of a diagram that maps the relationships ...