Asian House Martin
Delichon dasypus
The adult Asian house martin of the nominate subspecies is 12 cm (4.7 in) long, dark steel blue above with a contrasting white rump, grey-washed white underparts, and a slightly forked tail. The tail and upperwings are brownish-black, and the underwings are grey-brown. The legs and feet are brownish-pink and covered with white feathers, the eyes are brown, and the bill is black. There are few differences in appearance between the sexes, although the male is somewhat whiter below than the female, especially in fresh plumage.
ID text from Wikipedia, CC BY-SA 4.0
Western House Martin
Delichon urbicum
The adult western house martin is 13 cm (5 in) long, with a wingspan of 26–29 cm (10–11+1⁄2 in) and a weight averaging 18.3 g (21⁄32 oz). It is steel-blue above with a white rump, and white underparts, including the underwings; even its short legs have white downy feathering. It has brown eyes and a small black bill, and its toes and exposed parts of the legs are pink. The sexes are similar, but the juvenile bird is sooty black, and some of its wing coverts and quills have white tips and edgings. D. u.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Asian House Martin and Western House Martin.