Mating System: monogamous
House Sparrows form monogamous pairs for each breeding season. Nests are built between February and May. House Sparrows nest in crevices inside and on buildings, and in coniferous and deciduous trees. Nests are built from dried vegetation, feathers, strings, and paper. Eggs are layed at any time in the nesting period. One to eight eggs can be present in a clutch, with the possiblity of four clutches per nesting season. Incubation begins after all the eggs have been layed. Both males and females incubate the eggs for short periods of a few minutes each. Incubation lasts for 10 to 14 days. After the eggs are hatched, both males and females feed the young through regurgitation.
Breeding season: February through August in North America
Range eggs per season: 1.0 to 8.0.
Average eggs per season: 5.0.
Range time to hatching: 11.0 (high) days.
Average fledging age: 14.0 days.
Key Reproductive Features: iteroparous ; seasonal breeding ; gonochoric/gonochoristic/dioecious (sexes separate); fertilization (Internal ); oviparous
Average eggs per season: 5.
Both males and females incubate eggs and brood young until they have fledged. Both parents also provide their young with food.
Parental Investment: altricial ; male parental care ; female parental care