What is the pitch produced by a singing bird?

The pitch produced by a singing bird is determined by the frequency of the sound waves produced by the bird's vocal cords. The higher the frequency, the higher the pitch. The frequency of the sound waves is determined by the tension of the vocal cords and the speed at which they vibrate. The tension of the vocal cords is controlled by the muscles of the larynx, and the speed of vibration is controlled by the air pressure from the lungs. Birds can control the tension of their vocal cords and the air pressure from their lungs to produce a wide range of pitches.