The Black-rumped waxbill (Estrilda troglodytes) is a small, social finch native to African grasslands and woodlands, known for its black rump, unbarred back, and white undertail. It's similar to the Common Waxbill but distinguished by these features and a two-note "chee-churr!" song.

Key Characteristics

Appearance: Tiny finch with a black rump, unbarred back, and white undertail coverts. Males may have a faint pink wash on their underparts. 

Habitat: Dry grasslands, thickets, and grassy woodlands. 

Diet: Primarily eats seeding grasses, but also insects. 

Vocalization: Makes nasal and rasping calls, with a distinctive two-note song: "chee-churr!". 

Social Behavior: Lives in flocks, chirping and chattering. 

Distribution

Native Range: Sub-Saharan Africa, from Senegal to Ethiopia and south to Uganda and Kenya.