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The Yellow-billed Tit-Tyrant is a tiny flycatcher of shrubby Andean slopes and Patagonian regions. It is boldly streaked below, with wide whitish wingbars, and a jaunty bifurcated crest. When seen up close, the base of the mandible is indeed yellow, if not orangish. Overall, it appears more strikingly plumaged than the similar Tufted Tit-Tyrant (Anairetes parulus), with which it co-occurs across much of its range. Yellow-billed Tit-Tyrants are found from northernmost Peru south through the dry Andean Valleys of Bolivia, entering northernmost Chile and south to Argentine Patagonia. Shrubs are the prerequisite habitat component for this flycatcher, and compared to the Tufted Tit-Tyrant, it is found in slightly moister sites.