People usually sing because they like music or because they feel happy. They express their happiness 
by singing. When a bird sing, however, its song 
usually means much more than that the bird is happy. Birds have many reasons for singing. 
They sing to give
information. Their songs are their language.
The most beautiful songs are sung by male (cock) birds.
They sing when they want to attract a female (hen) bird. It is their way of saying that they are looking for a wife.
Birds also sing to tell other birds to
keep away. To a bird, his tree or even a branch of tree, is his home. He 
does not want strangers to come near
him, so he sings to warn them.
If a bird
cannot sing well, he usually has some other means of giving important
information. Some birds dance, 
spread out their tails or make other sings. One bird has a most unusual way of finding a wife. It builds a small garden of shells and flowers.
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