Bird calls are vocalizations made by birds to communicate with each other. Each species of bird has its own unique calls, which can be used to identify the bird, attract mates, defend territory, or warn of danger. Bird calls can be simple or complex, and can vary in pitch, volume, and duration.
There are many different ways to make bird calls. Some people use their mouths to imitate the sounds of birds, while others use whistles or other devices. There are also many different resources available to help people learn how to make bird calls, including books, websites, and recordings.