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Genus Delichon
Asian House Martin - This martin breeds in colonies, building mud nests under an overhang on a vertical cliff or the wall of a building. Both sexes build the nest, incubate the three or four white eggs and feed the chicks. The Asian House Martin feeds on small insects taken in flight, usually caught high in the air. The presence of terrestrial springtails and Lepidoptera larvae in its diet indicates that food is sometime picked from the ground.
Nepal Martin - This martin has blue-black upperparts with a contrasting white rump, and white underparts. It resembles its close relatives, the Asian House Martin and Common House Martin, but unlike those species it has a black throat and black undertail. It feeds in flocks with other swallows, catching flies and other insects in flight. It is subject to predation and parasites, but its status within its limited range appears secure.
House Martin - The Common House Martin , sometimes called the Northern House Martin or, particularly in Europe, just House Martin, is a migratory passerine bird of the swallow family which breeds in Europe, north Africa and temperate Asia; and winters in sub-Saharan Africa and tropical Asia. It feeds on insects which are caught in flight, and it migrates to climates where flying insects are plentiful. It has a blue head and upperparts, white rump and pure white underparts, and is found in both open country and near human habitation. It is similar in appearance to the two other martin species of the Delichon genus, which are both endemic to eastern and southern Asia. It has two accepted subspecies.