Wildlife exclosure to protect aspen from elk browsing at the base of the Sawback Range in the Bow Valley of Banff National Park in 1981 (Gary Trottier, Canadian Wildlife Service), 1992 (CW collection), 2000 (CW-2000-09C-04), 2009 (CW-2009-10-17-722), and 2017 (CW-2017-09-30-744).  The photo-point has moved 2 meters forward over the years due to increasing tree growth.