Noun tree sparrow has 2 senses
  1. tree sparrow, Passer montanus - Eurasian sparrow smaller than the house sparrow
    --1 is a kind of sparrow, true sparrow
    --1 is a member of Passer, genus Passer
  2. tree sparrow, Spizella arborea - finch common in winter in the northern U.S.
    --2 is a kind of New World sparrow
    --2 is a member of Spizella, genus Spizella
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