Fairly common where it occurs, Band-tailed Seedeater ranges along the Andes from northern Colombia to southern Argentina. They inhabit shrubby arid areas below the puna line, particularly around agricultural areas and hedgerows. They forage on the ground or in grasses. Though generally encountered as singles or pairs, they also join mixed-species finch flocks. This small seedeater can be distinguished by the unique white band at the base of the tail feathers. Also note the yellowish bill and white belly. Males are dark overall with rufous undertail coverts, whereas females are pale brown with crisp chest streaking. Their song is a fast, dry, short trill.