black-rumped waxbill
Specifically refers to the species Estrilda troglodytes, a small estrildid finch.
The black-rumped waxbill is a small bird native to Africa.
estrildid finch; waxbill
General term for any bird of the family Estrildidae, including waxbills, munias, and related species.
Birds of the estrildid family are kept as pets around the world.