ペルーミドリツバメ Tachycineta stolzmanni

Desert-loving swallow of northwestern Peru; occasionally (perhaps seasonally) crosses over the border into southwestern Ecuador. The only swallow in its limited range with a white rump. Underparts are faintly streaked, though this is only evident from close range. Entirely white lower underparts help separate it from Blue-and-white Swallow. Usually seen in pairs or small groups circling over desolate habitat or perched atop a small bush or tree.