A study of the avifaunas of three different types of bog-black sprucetamarack, white cedar-tamarack and open bog-at approximately the same latitude in central Michigan, indicated that only the black spruce-tamarack bog attracted boreal species of birds during the breeding season. The bog characterized by white cedar had species found in deciduous forest and edge habitat. Few, if any, bird species appear to be closely associated with white cedar. Open dry bogs had only species occupying early successional habitats and no boreal species of birds. The common yellowthroat (Geothlypis trichas) and song sparrow (Melospiza melodia), early successional or ecotonal species having small territories, were the only species found in all three types of bog in central Michigan. It appears that at least the structure of the vegetation and plant species composition determine which boreal species of birds inhabit these isolated bogs.