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Passer is a genus of sparrows, also known as the true sparrows.
The name Passer is the Latin word for "sparrow."

1/ House sparrow (Chim sẻ, sẻ nhà, sẻ ngựa, Passer domesticus)

2/ Eurasian tree sparrow (Sẻ, Passer montanus)

3/ Plain-backed sparrow (Sẻ bụi vàng, Passer flaveolus), also called the Pegu sparrow or olive-backed sparrow
flaveolus: Diminutive of flavus, yellowish

4/ Russet sparrow (Sẻ hung, Passer cinnamomeus), also called the cinnamon or cinnamon tree sparrow

Old World sparrows, also known as true sparrows, are a group of small passerine birds forming the family Passeridae.