The "song of birds" refers to the musical sounds produced by various species of birds. These songs serve multiple purposes, including attracting mates, defending territory, and communicating with other birds. Each species has its unique song, which can vary in pitch, rhythm, and complexity. Birdsong is often most prominent during the early morning and late afternoon, times when birds are most active. The sounds can be soothing and are an important part of many ecosystems, contributing to the overall ambiance of natural environments. Listening to the song of birds can enhance our appreciation of nature and biodiversity.