Analysis of information sources in references of the Wikipedia article "House sparrow" in English language version.
Status: Abundant naturalized species. Introduced in 1870 in belief that they would control flies in towns. A major threat to the breeding success of bluebirds. Local Habitat: Widespread in both built-up and in less developed areas. Habits: Nests February to July in roofs, cliffs, trees and bluebird boxes. Lays four to five brown speckled eggs.