A few alternate names for the Black-tailed Lavender Waxbill include Black-tailed Grey Waxbill, and also Grey Waxbill.  These small birds are Grey with a red rump and black line through the eye, along with red upper-tail coverts.  They are similar to the Cindarella Waxbill, but in comparison they have a darker shade of grey with a longer tail and no lower red flanks.  They are usually found south of the equator.