Most birds produce sounds in their throats using a voice organ called the syrinx. But not all birds’ calls can be described as ‘songs’. Males of only about 5000 species of birds are known to produce organized patterns of sounds that can be called melodious and described as songs. Male birds sing to attract females and to warn off other males. Although no two individuals sing alike, the song of each species is distinct. Most birds usually sing in the morning or evening and are quiet at midday. During winter most birds don’t sing, but they burst out into myriads of melodies with the onset of the spring, the time for courtship and breeding.