This male Common Yellowthroat Warbler is the only one I have seen, and the only photo I got. The male is above olive-brown color with a black facemask, a yellow throat, and a whitish belly. There is a white strip marking above the black mask. I didn’t see a female, who is similar except for the black mask. The habitat is swamps, marshes, and wet thickets. The range is the United States and Canada.
You can see the sited location at the Wehr Nature Center, Milwaukee, WI by clicking the link below. The Common Yellowthroat Warbler was sighted this year at the Wehr Nature Center, Milwaukee, WI.