Plain-backed sparrow Passer flaveolus

Male resembles a faded blend between House and Russet Sparrows, with a black throat, gray crown and nape, and dusty reddish brows and back. Female has a thin pale brow and is overall very plain and unmarked. House Sparrow females have a broader, more prominent brow stripe and are overall more strongly-marked. Both sexes of Russet Sparrow are likewise much more contrastingly patterned. Gives typical sparrow chirps and chirrups. Inhabits edge habitats including farmlands and gardens. Primarily a lowland species, but gets up into the foothills where it overlaps with Russet Sparrow.