In all plumages the back is olive, the underparts are yellow, and the tail has large white spots. The adult male’s black cap, collar, and throat form a complete “hood” around the yellow forehead and face, against which the large, dark eye stands out. The amount of black varies in other plumages, from quite extensive in many adult females to none at all in first-fall females. Some individuals may look rather like Wilson’s Warbler. However, Wilson’s is noticeably smaller—half an inch shorter, one-third lighter in weight, shorter-billed—and has no white in the tail. The songs are completely dissimilar as well.