Andean Swallow

The Andean swallow is 13.5 to 14 cm (5.3 to 5.5 in) long and weighs 14 to 19 g (0.49 to 0.67 oz). The sexes have the same plumage. Adults of the nominate subspecies have a mostly glossy greenish black head with black lores, gray ear coverts, and a gray-brown chin and throat. Their upperparts are mostly glossy greenish black with a brownish rump and uppertail coverts. Their tail is square or somewhat notched. Their breast and flanks are gray-brown and their belly and undertail coverts grayish white. Subspecies O. a. oroyae has a glossy blue-black head and upperparts. Voice: The Andean swallow's song is "a harsh short trill or a harsh, short, dry trrrrt". Its calls are "a dry, rising dzree and a descending, slightly more musical chleep".