Absolutely need a VERY SECURE duck lock up. Even here we do too. Mine should have been safe but for someone who we won't mention who forgot to latch the door on the duck house. All the fences in the world won't work if the human forgets to lock the gate. I doubt is that would happen again because the same person had to tell me what had happened then had to clean up and to try to nurse the survivors. (It didn't work).
The Duck girls were sure happy in the garden today! Sunshine, plus I was looking for any surviving tubers I had left in the ground. (Not many). The girls followed right along with me having a wonderful time checking out any dirt where I was digging looking for tubers.