This is what you have wandering around your home? They're so cute!
Anyway, when we rescued the baby ducks we found that there was a bird person who was happy to take them and, when they were ready, set them free. She would put 11 or 12 abandoned ducklings with a mommy duck, get the mommy duck used to the babies and off they would go together.
Everywhere I have ever lived there has always been some bird person willing to help out in situations like this. I tend to just throw them some money when I throw them whatever animal it is I felt the need to rescue.
You have a good boy there.