Plain-backed Sparrow

The plain-backed sparrow (Passer flaveolus), also called the Pegu sparrow or olive-backed sparrow, is a sparrow found in Southeast Asia. Its range spans from Myanmar to central Vietnam, and south to the western part of Peninsular Malaysia. Passer flaveolus is the scientific name used in the project list. This account uses species-wide information and does not imply that every trait has been documented separately in Vietnam. (Wikipedia, general species account).

Finches and estrildid finches are predominantly seed-eating passerines with bills adapted for husking or crushing plant material, although many also take small invertebrates, especially when feeding young. They often forage socially and may track seeding grasses or trees. These are broad family-level traits rather than Vietnam-specific breeding data (general finch and estrildid ecology). Regional observations can refine these broad expectations.