Although the prospective owner feels the bird is being handled very well, in fact the current or previous owner has created a relationship with this bird that is unhealthy. First of all, when the bird attacked the prospective new owner the previous or current owner picked up the bird, cuddled him all over the body and told him, “it was ok”. That’s basically rewarding this bird for unacceptable behavior. Behavior such as this is going to be difficult to reverse but it can be done.
When someone pets or strokes a bird all over its body it becomes a hormonal stimulant, and the bird starts reacting as if the person is his mate. So, when he flew at the visitor, he was protecting what he perceived to be his mate.
So where does the new owner go from here? First of all, it would be best if the bird was going to his new home in the cage he’s been living in. His adjustment to the change will be easier. The cage needs to be placed in a quiet area of the home, but where he can observe the daily coming and goings in the home at a safe distance. I always tell people a new bird’s cage should always be placed in a corner of a room and never next to a doorway or in front of a window. The problem with the doorway is when people come in and out of the room, the bird will always be on guard as to who or what is coming through. Since they are prey animals, they need a nano second to decipher in their brain who or what is coming through the door is friend or foe. This will keep the bird in a constant state of stress, and unfortunately negative behavior will most likely start. The first noticeable would most likely be screaming or feather picking or self-injurious behavior, and once this starts, it’s extremely difficult to reverse. Placing the cage in front of a window can trigger the same type of stress so I always suggest placing only half the cage in front of the window and the other half against the wall, so if something outside frightens the bird he can step out of sight of it.
The challenging part is going to create a strong but appropriate bond with the new owner. The first step is building trust. This is where the previous owner can be helpful, such as sharing what his favorite treats are. These treats can be used only as rewards when making friends with the bird. The new owner can start the training/bonding process by keeping the time short, like 15 minutes at a time and always begin and end on a positive note. The bird should never be punished for undesirable behavior, nor should he be picked up and cuddled and told it’s okay either. There needs to be clear and consistent communication with this bird to find success. Also if there are small children or pets in the home it’s important they do not stare or maintain constant eye contact with them because the bird will perceive this as a threat. If I can help any further, please reach out.