This is a great link to the Canadian Wildlife Federation. They want to recognize the efforts of average canadians that make their backyards hospitable to wildlife. The details are here and it seems quite easy; if you have a feeder, a tree, a birdbath, some plants and a woodpile, you probably already meet the criteria. Could be a neat little activity to do with kids.
http://www.wildaboutgardening.org/en/gab/section5_certify/index.htm