Junkin's Warbler Identified

Dave Junkin, an expert birder in New York, captured a small warbler while banding last year. He was unable to identify the species, but took a number of photos and measurements before releasing it. Posting it on the internet, many guesses were made, but not conclusively. The bird was recaptured, and a feather extracted for genetic testing. It turned out to be a hybrid of the mourning and Kentucky warblers. (News source.)