I think it takes a lot more than a self-closing door to traumatize a duck. That doesn't mean they will necessarily like it. But I do not feel that any duck could associate a door closing with you being the cause. The real proof will be seeing if they will continue to go into the house, or if the self-closing door will scare them too much. I don't think it will.
Now to the reasoning behind keeping them in. I forgot if you've said their ages. Have they already spent winters in the open? Remember, the more you do to affect the lives of wild creatures (or tamed creatures who have been living in the wild), the more you become responsible for them.
If you make the door out of a material they can see through, like some kind of screening, they might like that better. You're becoming a good duck Dad!
Now to the reasoning behind keeping them in. I forgot if you've said their ages. Have they already spent winters in the open? Remember, the more you do to affect the lives of wild creatures (or tamed creatures who have been living in the wild), the more you become responsible for them.
If you make the door out of a material they can see through, like some kind of screening, they might like that better. You're becoming a good duck Dad!
