American cliff swallow

English

Noun

American cliff swallow (plural American cliff swallows)

  1. A species of swallow, Petrochelidon pyrrhonota, found across the Americas.
    • 2018, Menno Schilthuizen, “Darwin comes to town”, in The Guardian‎:
      Researchers in the US found that the wingspan of American cliff swallows, which took up the habit of colonising concrete highway bridges in the 1980s, had decreased by about two millimetres a decade since then.
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