Dave and I found this Bay-breasted Warbler on May 20th this year at Creve Coeur Lake in St. Louis County. Always a pleasure to find a singing Bay-breasted.
Bay-breasted Warbler
"What a thousand acres of Silphiums looked like when they tickled the bellies of the buffalo is a question never again to be answered, and perhaps not even asked." -Aldo Leopold
A Thousand Acres of Silphiums 
Excellent photos of the Warbler!!
Thanks Shawn!