The sparrow and the tree sparrow are small birds that usually spend time in flocks. By grouping together, the sparrows are safer from predators. 

Both the sparrow and the tree sparrow are seed-eaters.

The tree sparrow (on the right) can be distinguished from the common sparrow (alla) by its brown forehead and white cheeks. The cheek of a tree sparrow also has a small, black dot, unlike that of a common sparrow. Both male and female tree sparrows look alike. 

The sparrow can usually be found near thick hedges and shrubberies. The tree sparrow can likewise be found near thick shrubberies, but it also enjoys spending time in trees. 

On the right: a tree sparrow. Below: a common sparrow.