I inherited a baby duck who is only about 3 days old. It can not use it's legs properly and its mama duck rejected it. It flips over onto its back a lot when it tries to walk. It seems almost as if its legs don't bend properly. He is really sweet and alert despite everything else. Is there ANYTHING I can do to help him and try to save him? I'm afraid it will just be worse as he gets bigger, but I don't know much about ducks. I would love to be able to keep him as a pet if he is savable.