SCIENTIFIC NAME: Estrilda troglodytes
The Black-rumped Waxbill is a common species of estrildid finch. It is a small, slender, pale-gray-to-sandy-brown finch with a vivid crimson mask, coral-red bill.
It is about 4 inches in length.
Males and females are similar, but males have a faint pink wash on the underparts that females lack. They have a black rump, unbarred back, white undertail, and square-tipped tail.
Immature birds are similar to the adults, but are plainer and have a small blackish mask. Bill is black, as in other immature waxbills.
Gives various nasal and rasping calls; song is two note "chee-churr!".
Inhabits dry grasslands, brush and scrubby woodlands.
Native to Africa and introduced to several Caribbean islands, Japan, Spain, and the Hawaiian islands (apparently now extirpated).