Chilean name: Cachudito del norte
The Yellow-billed Tit-tyrant is distributed from the north of Peru to northern Chile and into Bolivia and western Argentina but reaching as far east as Buenos Aires in the non-breeding season. It is found mainly in arid and semi-arid scrub and woodland at between 1,000 and 3,700 metres.
|It is similar to Tufted Tit-tyrant A. parulus but has a dark eye
and a yellow base to the lower mandible. The crest is shorter and
broader with a white crown patch not really visible in these
This bird is not like most illustrations in that it does not show the two bold white wing-bars and the breast and belly are a diffused dusky colour rather than showing bold streaks and yellow towards the vent. This makes me wonder if the bird is a juvenile or in some degree of moult.
There are recordings and a distribution map on xeno-canto.