Behavior Song Sparrows are known to be monogamous with occasional polygyny being observed. Males have not been reported to feed their mates. Song Sparrows are very territorial. This is the most recognizable aspect of the male. The males arrive ahead of the females on the breeding grounds and starts to define his territory by puffing out his plumage, extending and fluttering its wings and by singing from three or four main perches.
Territorial defense relies mainly on singing and occasionally agressive behavior toward other males.
The males announce their identity by its territorial singing and aggressive behavior. The females announce their identity by either a high pitched note, or a nasal kind of chatter. Pair bonding occurs on the territory of the male. The females do the selecting of males. The males sole act of courtship consists of pouncing.