Description : Sparrow or Chorui (in Bangla) on a tree in Avaynagar, Jessore, Bangladesh. Sparrows are small passerine birds. Generally, sparrows are small, plump brown-grey birds with short tails and stubby yet powerful beaks. They are primarily seed-eaters, though they also consume small insects. A few species scavenge for food around cities and, like gulls or pigeons, will happily eat virtually anything in small quantities.