Vocal signals are sounds produced by living organisms, primarily used for communication. These signals can include a variety of noises, such as calls, songs, and cries, which convey different messages. Animals like birds use vocal signals to attract mates, warn of danger, or establish territory. Humans also rely on vocal signals, using speech and tone to express emotions and intentions. In addition to conveying information, vocal signals can vary in pitch, volume, and rhythm, allowing for a rich form of communication. Whales, for example, produce complex vocalizations that can travel long distances underwater. Understanding these signals is essential for studying animal behavior and communication.