The Southwestern Willow Flycatcher (Empidonax traillii extimus) is a small insect-eating bird of the tyrant flycatcher family. Adults have brown-olive upperparts, darker on the wings and tail, with whitish underparts; they have an indistinct white eye ring, white wing bars and a small bill, the breast is washed with olive-grey, the upper part of the bill is grey; the lower part is orangish.