Aspen grow in "clones," or groups of genetically identical trunks. Some clones are thousands of years old, although individual trees live 150 years at most. One especially large stand in Utah ...

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

It chews on aspen with its large incisors, in preference to other trees, felling them to build ... is found in much of Canada and the northern USA. In Utah, one stand of aspen has been identified ...