Two years after the federal government released a strategy for preventing the extinction of Canada’s dwindling herds of boreal woodland caribou, little has been done by provinces and territories to put that plan into action.

A report to be released Tuesday by the Canadian Parks and Wilderness Society (CPAWS) says the animals, which roam the northern forests that stretch from British Columbia to Labrador, continue to die off as their ranges are eroded by human activity.

“At this point, all of the...