insects, spiders, succulent vegetation, seeds, and small
fruits.
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The scientific or taxonomic name would be Amphispiza belli.
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a or the
A sparrow landed on the roof. There was a loud noise and the sparrow flew away.
The first time you talk about something ( sparrow) use a, because we don't know about the sparrow, this is any sparrow. The second time sparrow is mention use the because we now know what sparrow you are talking about - it is the sparrow on the roof.