House Sparrows mainly eat seeds, cracked open by their strong beak. They are opportunists though, readily eating most scraps, and will happily visit bird tables and eat seeds and nuts from feeders. When nesting they feed their chicks mostly insects, including caterpillars, aphids and beetles.
What seed do sparrows like best?
Small seeds, such as millet, attract mostly house sparrows, dunnocks, finches, reed buntings and collared doves, while flaked maize is taken readily by blackbirds.