It is a medium-sized bird found in Argentina, Brazil, Paraguay, and Uruguay, where its natural habitats are dry savanna, swamps, and pastureland.

The yellow-rumped marshbird is named for its yellow belly, flanks, thighs, and rump.

[2] The species exhibits slight size dimorphism, with males weighing on average 91.2 g and females weighing on average 81.9 g.[3] The yellow-rumped marshbird is found in southeastern Brazil, eastern Paraguay, northern Uruguay, and the Misiones and Corrientes provinces of northeastern Argentina.

[2] It is most commonly found in shrubby marsh or moist grasslands and avoids treeless habitats.

From September through November, single marshbird pairs can be observed, indicating the beginning of the breeding cycle.