I used to have ducks when I was a child that would come to me when I called and let me handle them. I recently moved to where I could have ducks again and I went to the flea market and bought a pair to start with. I have had them for over a month and they still run at the sight of me or anyone else that approches them. It's been almost 30 years since the first time I had ducks. What should I do?