Here's a link to a web site that is raising money that, in combination with ongoing management efforts by the USFWS, is helping maintain essential, suitable habitat for this species to successfully nest in Wisconsin and Michigan:
Here, you'll learn about the Kirtland's Warbler Initiative:
Kirtland's Warbler Initiative
Please feel free to donate money to this group, per the web site's instruction.
Regards and now back to warbler sleuthing....Daniel