| Dancing Grizzly Visit http://nrmsc.usgs.gov/research/KendallRemoteCamera.htm for more information, video, and transcripts. Grizzly bear vigorously rubbing on a natural marking tree in Glacier NP, Montana. Rubbing is a form of chemical communication. DNA analysis of hair collected from natural rub trees is used to identify individual bears and census the population. USGS Northern Divide Bear Project remote video by J.Stetz / A.Macleod. August 12, 2006. Tags: grizzly bear rub tree DNA USGS research Kate Kendall Glacier National Park Montana |