Why the myna becomes more aggressive as you raise it has something to do with the way the owner raises it. If you keep the myna at home with little contact with people every day, then of course it will become aggressive when it sees unfamiliar people. This is the nature of animals. In order for the myna to become docile, we need to familiarize it with the human living environment from an early age.

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There are also some starlings that may be naturally more aggressive. For birds like these, we shouldn’t think about changing them. We can just change the target.