Birds can make a call, mainly dependent on the tweet. The pipe of the parrot is very complete. It has 4-5 pairs of luming muscles. Under the control of the nervous system, these luming muscles can shrink the half-moon membrane in the ring tube, and the vibration vibration can produce sounds. The vocal of the cuckoo is very similar to humans. The human voice starts from the sound cord of the throat and reaches the tongue end. The length of the pipe of the parliament to the tongue is 15 cm, and the angle of its twin tube and the axis of the body shaft is approximately right angle. The vocal and body shafts are in a right angle, and a folding cavity will be formed, and there will be a segmented sound. This occurrence of the split sound is the basis of the language sound and the development of the language. Because of this, the parrot can imitate people to speak after training
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