This second warbler is also not difficult. Canada Warblers are proclaimed by their golden lores, white eye rings, and black necklaces. Males have darker necklaces than females, but many fall birds are intermediate, making sexual identification difficult.
Tennessee Warblers show considerable variation. Often they are muted shades of yellow. This gray-headed individual is one of the few adult warblers I banded this August. In any plumage, a good key to identification is the black line through the eye. The predominance of young birds has me a bit puzzled.
This final bird is the toughest of the lot to identify. Note the bright yellow underparts and weak white line surrounding the eye. The bill is relatively robust, at least compared to the other warblers on this page. One key to the identity of this Mourning Warbler is the dark line below the throat.