I'm a first time bird owner, Kiwi is my first feathered friend
> and I love him to death. Recently I've seen a change in his behavior
> again. He's aggressive when he's on/in his cage. He nips at me when I
> try to get him off of his cage. After he does finally come to me he's
> great. He'll love on me, allow me to pet him for hours. Is there
> anything I can do to help get him over his desire to bite me? I'm the
> only person in my house that can even handle this bird. If anyone else
> tries he freaks out and flaps his wings, screeches and tries to run
> away. I just really need some advice. I was told that Nandays are the
> most gentle and loving birds, but honestly I've not seen much of that
> from Kiwi!!
Hormonal Nandays can be aggressive and territorial, but what you describe is so extreme that I wonder if Kiwi has some bad experiences in his past that make him nervous. If he has, then you being scared only reinforces him being scared.
If I were you, I would leave him alone around his cage as much as possible, and let him come to you. Or, at the very least, wait until he shows signs of wanting to coming to you before you pick him up from the cage. Let the cage be a safe place for him that he doesn't have to defend.
Leave the cage to him for about a month. Then try feeding him when he's on the cage, so he starts viewing your nearness to the cage as non-threatening.
Other members of your family should try sitting near him, talking to him, and feeding him, always moving very slowly around him. These are the main tools for befriending a bird and should eventually work.
However, be aware that a traumatized bird can take months or even years to recover, and be prepared to be patient. Remember that Kiwi isn't a nasty bird, but one who has survived some unpleasant treatment.