Sparrow Biology & Reproduction

Sparrow General Biology, Reproduction, and Behavior

Breeding for sparrows can occur in any month of the year, but is most common from March through August. Sparrow nests are typically an untidy mess of dried grass, leaves, pine straw, string, paper and feathers and nest building may begin just a few days before the first egg. The nests are reused year after year. Sparrows tend to be “home bodies,” spending their entire life 2 to 3 miles from their roosts and feeding sites.

House sparrows aggressively defend both their nesting and feeding sites, destroying eggs and injuring or killing other competitive species.

From 3 to 7 eggs are laid, 4 to 5 being the most typical. Incubation takes 10 to 14 days, and the young stay in the nest for about 15 days. On average, it takes 30 days from the time eggs are laid to produce a juvenile adult with sexual maturity coming in 6 to 9 months.

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