The Common house martin (Delichon urbicum) is a migratory passerine bird which breeds in Europe, North Africa and across the Palearctic; and winters in sub-Saharan Africa and tropical Asia. It feeds on insects that are caught in flight, and it migrates to climates where flying insects are plentiful. Both the scientific and colloquial names of the bird are related to its use of human-made structures. It builds a closed cup nest from mud pellets under eaves or similar locations on buildings usually in colonies.
The Common house martin 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.
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