Which subspecies of *Empidonax traillii* is federally endangered and breeds in the arid Southwest?
Answer
E. t. extimus
The Willow Flycatcher species is divided into several subspecies, and one specific form is recognized for its precarious conservation status. The subspecies designated as *E. t. extimus* is the federally endangered Southwestern Willow Flycatcher. This population, which breeds in the arid regions of the Southwest, exhibits distinct plumage patterns; it is noted for being particularly paler on the back and especially on the head when compared to other western subspecies like *E. t. adastus* or *E. t. brewsteri*. Furthermore, the breast-band in *E. t. extimus* tends to be paler gray and less distinct than in its relatives.
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