Learn the “Language of the Birds” 

　　The cries of birds are multivariate and complicate. They are important methods for birds to communicate with one another. The cries of birds can be classified into two types, i.e. “chirping” and “singing”. Birds' chirping is rather simple but it means a lot. Birds chirp to indicate danger, warning and communication. Both male and female birds can chirp. The singing of birds is quite sweet and agreeable, often with a melodious tone. In most case, male birds will sing in mating seasons. It's the signal of a male bird to seek for spouse after occupying a territory. 

　　It’s quite interesting to listen to the chirping of birds. Attention must be paid to the syllables and changes of the chirping when listening. People should judge whether the chirping is in single syllable or in plural syllables；whether it is in a continuously repeated tone or in varied tones； and whether it is rather course or is refined. People should also judge whether the chirping is like whistling or the friction sound of metals? If the chirping of birds is accompanied with concords, it will be more beneficial for people to recognize and to memorize them. The chirping of cuckoo is like “bugu”；the chirping of hawk cuckoo is like“beibeilou” or“cuiguya”； small cuckoo's chirping is like“youqian dajiu hehe”, while the chirping of Flycatcher and Grey-headed canary flycatcher sounds like“qingqing xiuxiu”. Attention should also be paid to the reaction of birds while listening to their chirping. So to speak, the chirping for their communication can let all birds of the same kind gather together； while the warning chirping will make the birds disband and fly away in no time. If you often observe their chirping, you’ll get to know their language and become an expert in understanding birds.