Delichon urbicum
Family: HirundinidaeGenus: Delichon Distinctive small swallow with blue-black upperparts, a big white rump patch, and snow-white underparts. Juvenile in late summer and autumn is duller above and dingier below than adult. Compare with other swallows; note the relatively shallowly forked and streamerless tail, as well as jerky and fluttery flight. In east of range, overlaps …
