Volunteers stoke the fires of several burn piles during a invasive species removal event to reestablish native prairie. Photo by Patrick Gleissner. Published December 8, 2020 at 600 × 400 in Volunteers Ensure Successful 2020 Trailbuilding Season ← Previous Next → Volunteers constructed several burn piles during a invasive species removal event to reestablish native prairie in the Muir Preserve. Photo by Patrick Gleissner.