ScienceDaily (Oct. 24, 2011) — The reclusive American marten is getting even harder to find in the Sierra Nevada, according to a study by a team of researchers from the U.S. Forest Service and Oregon State University. A new study at the Sagehen Experimental Forest found that marten detections have dropped 60 percent since the 1980s — a decrease that may be caused by a degradation of the wooded areas in which they live, researchers say.
http://www.sciencedaily.com/releases/2011/10/111024153444.htm