Eurasian tree sparrow
The russet sparrow has usually been placed in the genus "Passer", and within this genus it is seen as a part of the "Palearctic black-bibbed sparrow" group, which includes the Eurasian tree sparrow as well as the house sparrow. It has generally been seen as a close relation of the house sparrow, and Richard Meinertzhagen even considered it to be the same species as the Somali sparrow, one of the house sparrow's closest relatives.