Why does a parrot learn from others

The oral structure of the parrot is special and has the ability to imitate, so he can speak.It should be noted that there are more than one type of birds. Because there are many varieties, the imitation ability is different, such as the small parrots such as peony parrots, tiger parrots, cocktose, etc., basically they will not learn tongue., Macaw, Sunflower Parrot, etc., can imitate other voices.