house martin
US /ˈhaʊs ˌmɑːr.tɪn/
UK /ˈhaʊs ˌmɑːr.tɪn/
1.
a small swallow-like bird with a forked tail, blue-black upperparts, and white underparts, typically nesting in colonies on buildings
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A house martin built its nest under the eaves of our roof.
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We watched the house martins darting through the air, catching insects.