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The house sparrow is named because they often nest in holes of roofs.

House Sparrow

The house sparrow is named because they often nest in holes of roofs.

"Passer domesticus, House Sparrow, The sexes may be similarly coloured or very different, the hues being commonly sober, but sometimes particularly brilliant. The feet are usually dull... the bill may be blackish, yellowish, dusky, or even red." A. H. Evans, 1900

Two House Sparrows, One Looking Down, One looking Straight, Sitting on the Top and Edge of a Structure

"Passer domesticus, House Sparrow, The sexes may be similarly coloured or very different, the hues being…