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Delichon Urbicum Video Stock Footage

The adult common house martin of the western nominate race is 13 cm (5.1 in) long, with a wing span of 26–29 cm (10–11 in) and a weight averaging 18.3 g (0.65 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. lagopodum differs from the nominate race in that its white rump extends much further onto the tail, and the fork of its tail is intermediate in depth between that of D. u. urbicum and that of the Asian house martin. The white rump and underparts of the common house martin, very noticeable in flight, prevent confusion with other widespread Palaeoarctic swallows such as the barn swallow (Hirundo rustica), sand martin (Riparia riparia) or red-rumped swallow (Cecropis daurica). In Africa, confusion with grey-rumped swallow (Pseudhirundo griseopyga) is possible, but that species has a grey rump, off-white underparts and long, deeply forked tail. The common house martin flies with a wing beat averaging 5.3 beats per second, which is faster than the wing beat of 4.4 beats per second for the barn swallow, but the flight speed of 11 m·s−1 (36 ft·s−1) is typical for hirundines. The common house martin is a...

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Animalia: Chordata: Passeriformes: Aves: Hirundinidae: Delichon urbicum

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