A small swallow with white underparts and dark blue upperparts. The tail shows an unusual pattern: a dark rim around large white panels both above and below. Found very locally in southern Ethiopia in open thorn savanna, in areas with many large termite mounds. Often in pairs. Similar to Gray-rumped Swallow, but easily separated by the white in the tail. Could be confused with Common House Martin, but has white in the tail rather than a bold rump patch.