In South America, the Yellow-browed Sparrow is the tropical grassland replacement of the Grassland Sparrow (Ammodramus humeralis). The Yellow-browed Sparrow does well in much more coarse grassland, in hot lowland areas in the tropics. It is currently showing a major population boom as it is benefiting from forest clearing in the Amazon basin. Once the forest is cleared and agriculture comes in, or rank grass grows up instead of trees, this sparrow moves in. Unlike the Grassland Sparrow which requires older grasslands and less disturbed areas, it appears that the more disturbed the better for the Yellow-browed Sparrow. This sparrow is a short-tailed sparrow, but with oversize long and large legs, and usually a rather prominent long bill; it does not have the same large-headed look of the Grassland Sparrow. More than yellow-browed, this sparrow is yellow faced as the yellow of the supra-lores typically bleeds out to much of the fore face. The upperparts of this sparrow are only obscurely streaked, making it look much more solid in coloration above than is typical for an open country sparrow. Its underparts are pale grayish, and the brown wings show an obvious yellow bend, and sometimes this extends as a yellow shoulder patch.