The song of the willow warbler can be heard in the forests of Northern Europe.

The forest's soundscape is dominated by birds. During spring and summer, birdsong can be heard everywhere in nature. Why do birds sing?

Birds sing mostly during their reproductive season, which takes place during the spring and summer months. Their songs have two functions. The male birds attract females with their song in order to reproduce and nest. However, male birds also sing for other males. By doing so, they announce their territory, protecting it from other males.

The best-known songbirds include the chaffinch and various thrushes, such as the blackbird and the redwing. The willow warbler and the tree pipit are some of the most numerous forest-dwelling birds, but their songs are less often identified.

The majority of forest-dwelling songbirds are migrating birds. They migrate to the south for the cold winter months and return back north during the spring.