http://www.columbia.edu/itc/cerc/danoff-burg/invasion_bio/inv_spp_summ/Passer_domesticus.htm

Adult house sparrows are about 6.25 in long, weigh about 28 g and feature short wings, short tails and relatively large heads. Adult males have a black throat, a black v-shaped patch on the breast (darkest during breeding season and faded at other times), a light gray flank and belly, darker gray tail and crown, a chestnut-colored nape, broad white tips on the median coverts (which dull considerably outside the breeding season), brown feathers elsewhere on the wing and back and a black bill during breeding season (which is yellowish at other times). Adult females have duller colors throughout – a duller gray crown with a lighter streak at and behind the eye, a gray-brown throat, breast, flank and belly, a gray tail and dull brown feathers on the wings and back. The song is a series of single-note chirps.