Eurasian tree sparrows and black bulbuls may sometimes use abandoned nests.

It flies together/commonly with Eurasian tree sparrows and chestnut munias.

In many aspects of its behaviour, the russet sparrow is similar to the house and Eurasian tree sparrows.

Isolated pairs are usual, though it sometimes breeds in small groups, with members of its own species as well as house and Eurasian tree sparrows.

The russet sparrow is the typical sparrow of human habitations in towns where the house and Eurasian tree sparrows are absent.

Adult Eurasian tree sparrows were affected more often than juveniles and males were affected more often than females.

Adult and juvenile Eurasian tree sparrows undergo a slow complete moult in the autumn, and show an increase in body mass despite a reduction in stored fat.

In 1870, a Carl Daenzer, perhaps the same person, released 20 Eurasian tree sparrows from Germany into Lafayette Park in St. Louis.

Many species nest on buildings, and the house and Eurasian tree sparrows in particular inhabit cities in large numbers, so sparrows are among the most familiar of all wild birds.