- 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 - 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