The wire-tailed swallow (Hirundo smithii ) is a small passerine bird in the swallow family. It has two subspecies: H. s. smithii, which occurs throughout Africa, and H. s. filifera, which is found in southern and southeastern Asia. It is mainly resident, but populations in Pakistan and northern India migrate further south in winter. The genus name Hirundo is the Latin word for swallow. The species name smithii commemorates Christen Smith, a Norwegian botanist and geologist.
The wire-tailed swallow is a small swallow, measuring 18 cm (7.1 in) in length. It has bright blue upperparts, bright white underparts and a chestnut cap. Immature birds lack tail wires, and have dull brown (rather than chestnut) caps. The species is named for the very long filamentous outermost tail feathers, which trail behind like two wires. The sexes are similar in appearance, but the female has shorter "wires". Juveniles have a brown crown, back and tail. The Asian form, H. s. filifera, is larger and longer-tailed than the abundant African H. s. smithii.
This bird is found in open country near water and human habitation. Wire-tailed swallows are fast flyers and they generally feed on insects, especially flies, while airborne. They are typically seen low over water, with which they are more closely associated than most swallows.
The neat half-bowl nests are lined with mud collected in the swallows' beaks. They are placed on vertical surfaces near water under cliff ledges or nowadays more commonly on man-made structures such as buildings and bridges. The clutch is three to four eggs in Africa, up to five in Asia (Turner and Rose). These birds are solitary and territorial nesters, unlike many swallows, which tend to be colonial.
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