Bay-breasted & Blackpoll Warblers

Fig. 1: The dynamic duo. Blackpoll (top) and Bay-breasted (bottom)

For North American birders, Blackpoll Warbler (Setophaga striata) and Bay-breasted Warbler (Setophaga castanea) are the quintessential "confusing fall warbler" pair.

A few diagnostic traits immediately separate the species. Even without seeing these field marks, a first impression of color and contrast is telling. Of course, as with any identification, it's best to observe the bird carefully, collecting as many traits as possible before making the call.