c_rowland 的鑑定

With Dave Gagne originally, joined by Don Fraser, Christine Rowland, Joe Colontonio, and Joanne Chamberlain once we put out the word about the Philly Vireos.

There seemed to be two Philly Vireos, differing most noticeably in the amount of yellow on the breast and undertail coverts, although some lighting conditions appeared to reduce the color contrast.