Editing Old World sparrow (section)

== Behaviour and ecology ==
Old World sparrows are generally social birds, with many species breeding in loose colonies and most species occurring in flocks during the non-breeding season. The [[great sparrow]] is an exception, breeding in solitary pairs and remaining only in small family groups in the non-breeding season. They form large roosting aggregations in the non-breeding seasons that contain only a single species (in contrast to multi-species flocks that might gather for foraging). Sites are chosen for cover and include trees, thick bushes and reed beds. The assemblages can be quite large with up to 10,000 house sparrows counted in one roost in Egypt.<ref name=HBW/>

The Old World sparrows are some of the few passerine birds that engage in [[dust bath]]ing. They will first scratch a hole in the ground with their feet, then lie in it and fling dirt or sand over their bodies with flicks of their wings. They will also bathe in water, or in dry or melting snow. Water bathing is similar to dust bathing, with the sparrow standing in shallow water and flicking water over its back with its wings, also ducking its head under the water. Both activities are social, with up to a hundred birds participating at once, and is followed by preening and sometimes group singing.<ref name=HBW/>

<gallery widths="200px" heights="200px">
File:Passer luteus flock Red Sea Sudan.jpg|[[Sudan golden sparrow]]s, seen here on the [[Red Sea]] coast of [[Sudan]], are highly gregarious outside of the breeding season.
File:Sparrows_bathing.ogv|House sparrows water bathing near [[Black Sea]] in [[Batumi]], [[Georgia (country)|Georgia]]
</gallery>

=== Eggs ===
The house sparrow typically lays 3-6 eggs, but has been known to lay as few as 1 and as many as 8 greenish-white eggs. The incubation period is typically 10–14 days.<ref>{{cite web |title=Hoiuse Sparrow |url=https://www.audubon.org/field-guide/bird/house-sparrow |website=Aububon.ordg|date=13 November 2014 }}</ref>