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As a matter of fact, people usually sing because they do like music or because they feel happy(1)___________________________When a bird sings however, its song usually means much more than a bird is in a good temper. Birds have a variety of reasons for singing. They sing to give information and their songs are their languages. (2)___________________ They sing when they want to attract a female bird. It is their special way of saying that they are looking for a wife and any other birds who are interested can respond to his song. Birds also sing to tell other birds to keep away. To a bird, his tree or even a branch of the tree is his home. He does not want strangers come near to his home. So he sings in order to warn them away. (3)_____________________________ For example, some birds dance, spread out their tails or make other kinds of signs. There is also a special kind of bird which builds a small garden of shells and flowers to attract a female bird’s attention.
1.they express happiness by means of singing
2.love songs are sung by male birds
3.on the other hand,if a bird can not sing well,he usually has some other means to give important information
1)They expressed her happiness by meaning the singing
2)Love songs are sung by male birds
3)On the other hand ,if a bird can not sing well, he usually has some other means giving important information