Bird song refers to the vocalizations produced by birds, primarily for communication. These sounds can serve various purposes, such as attracting mates, defending territory, or signaling alarm. Each species has its unique song, which can vary in pitch, rhythm, and complexity. Bird songs are often most prominent during the breeding season when males sing to establish their presence and attract females. The study of bird song is important in fields like ornithology and ecology, as it can provide insights into the health of bird populations and their habitats.