Andrew Richardson, an ecologist at Northern Arizona University, maintains a camera at Hart Prairie, about 8,000 feet above sea level on the west side of the San Francisco Peaks near Flagstaff. While ...

Leaves often turn brilliant colors in autumn. One of those colors has generated a lot of heated debate among scientists in recent years. Autumn is a big time for trees. Many shed their leaves, and of ...

TOLEDO, Ohio — The fall season is quickly wrapping up and, as the winter chill inches closer, the life cycle of fall colors will end, leaving trees with only their branches left to stand. Throughout ...