The Tree Sparrow, called Eurasian Tree Sparrow in the Americas, occurs from Western Europe through to Far East Asia.
It has an all chestnut brown "hairstyle" plus a white collar and a distinctive black cheek patch. Unusually for sparrows, the male and female have similar plumage.
A shy rural bird in the UK, it is a gregarious urban bird like the House Sparrow in parts of Europe, Asia (native) and Australasia (introduced).
These photos of a pair of Tree Sparrows building their nest in a pipe were taken by Alexandra Makhnina in Kazakhstan and are used with permission.
The similar plumage of the male and the female, unlike that of House Sparrows, can be seen.