One of the world's best-known and most abundant small birds (Passer domesticus, family Passeridae). It lives in towns and on farms worldwide, having accompanied Europeans from its original home in Eurasia and northern Africa. Introduced into North America in 1852, it spread across the continent within a century. It is about 6 in. (15 cm) long and buffy brown; the male has a black bib. House sparrows breed nearly year-round in warm regions. See alsosparrow.