Thanks again for writing….Great question, per your last ones last month here at this blog.
Beg my pardon for a moment before I answer your question, please….as I wish to note that your question arrives as this blog celebrates its 17th anniversary this month. So thanks to all the readers.
Now to answer your question. Indeed, this one-time endangered wood-warbler species continues to thrive, with breeding success ongoing annually…..and, as a result, it was delisted and removed from the federal endangered species list in 2019.
A fine article noting this trend is at: https://www.michigan.gov/dnr/about/newsroom/releases/2021/10/25/kirtlands-warbler-census-shows-once-endangered-songbird-continues-to-thrive
Additional interest information (and more recent updates) for this Michigan, Wisconsin and, at one nesting site in Ontario, is present at:
Meanwhile, it’s time for an upcoming birding tour this week to the Sonoma County coastline with a group of birders* that I’ll meet there.
(* = my background and tour information is at WarblerWatch.com
PS: Other news updates:
My bird surveys for shorebird family members will keep me busy for the rest of November, including several in the SF Bay north bay….in addition to volunteering for the annual Point Blue Conservation Science Shorebird Survey (that I have assisted for the last 11 years….i.e., 11 years? Yes, hard to believe the years “fly” by so fast…).
Warbler Watch 
You must be logged in to post a comment.