Feldsperling
The male calls from near the nest site in spring to proclaim ownership and attract a mate. He may also carry nest material into the nest hole. The display and nest building is repeated in autumn. The preferred locations for the autumn display are old Eurasian tree sparrow nests, particularly those where nestlings had hatched. Empty nest boxes, and sites used by house sparrows or other hole nesting birds, such as tits, pied flycatchers or common redstarts, are rarely used for the autumn display.