Brown bird with a long, spiky tail found in highlands from southern Peru to northern Argentina. Plain, nearly unmarked underparts and dark stripes on back help to separate it from most other montane canasteros. Very similar to Streak-backed Canastero, but has a blacker, less rusty tail; also note range. Inhabits open areas with tall grass. Typical song is a rattling trill that rises first, then falls at the end.