We found a tiny duckling in our garden years ago
We reared him on dried shrimps and he learned to swim in a paddling pool for tots.
The only problem was that "colin" didn't fly,he would just waddle after us and panic if we walked too fast.
After much debate it was decided that he would be rehoused in a wild life park where he could be with other ducks,it broke our hearts,but sometimes you have to think of the animal and not yourself.
You did the right thing,a duck that doesn't know that he isn't a human just doesn't work!
Tickled