Brown-bellied Swallow

The brown-bellied swallow is about 14 cm (5.5 in) long and weighs about 12.5 g (0.44 oz). The sexes have similar plumage though females are duller overall than males. Adult males of the nominate subspecies have a mostly blackish head and neck with a blue-green gloss and a sooty gray-brown throat. Their upperparts are blackish with a blue-green gloss. Their tail is moderately forked; it and their wings are dark brown. Their underparts are mostly sooty gray-brown with black undertail coverts. Juveniles are duller than adults with a brown throat, gray-white underparts, and a shorter tail. Voice: The brown-bellied swallow's song is "a weak buzzing" and its contact call a "tjrip tjirp-tjrip-tjirp". One description of its flight call is "a rather scratchy tjrrrp". Its call is also described as a "deep, buzzy tchjet" that sometimes is extended to "tchjet-djshhhhEW".