 The Sind sparrow ( Passer pyrrhonotus ) is a passerine bird of the sparrow family Passeridae , found around the Indus valley region in South Asia . It is also known as the jungle , Sind jungle , or rufous @-@ backed sparrow . Very similar to the related house sparrow , it is smaller and has distinguishing plumage features . As in the house sparrow , the male has brighter plumage than female and young birds , including black markings and a grey crown . <unk> , the male has a chestnut stripe running down its head behind the eye , and the female has a darker head than other sparrow species do . Its main vocalisations are soft chirping calls that are extended into longer songs with other sounds interspersed by breeding males . Historically , this species was thought to be very closely related to the house sparrow , but its closest evolutionary affinities may lie elsewhere . Discovered around 1840 , this species went undetected for several decades after its discovery . 
