I had multi Ducks attacked it is a very time-consuming event and devastating... But what I did was I washed up all the injured Birds and I put antibiotic ointment on them and the worst ones I did twice a day! Also wanted to let you know that we killed the first weasel and then it was a month later its mate showed up and we caught and killed that in a live trap to so keep your traps set! I selpt little knowing those bastard were around.
@Tilly6
You should keep the traps out for a while. Even if it was only one that attacked your ducks, there is a good chance there may be more.
I would even set multiple traps for better odds of catching them.
And make sure you kill the mink or whatever you catch (raccoons, possums, etc. they can still be a threat). I understand it may be hard, but if you release it, this whole thing will happen all over again and your ducks may be in greater danger since the mink knows how to get in even if you rebuild the coop/pen.