We have ducks. Several weeks ago I noticed a few burrows going down under the pond liner that we have, and a few weeks ago, I flooded them thoroughly enough to drive a huge fat momma rat with swollen udders out of the pen where my malamute/pit mix promptly caught, killed, then didn't know what to do with it. I collected it and trashed it. Thinking that I had killed any potential young by flooding the tunnel, I left it at that. A week ago, I caught & killed one, and the dog caught & killed another. One got away. A couple days ago, I flushed the one that got away out, and the dog killed it as well. There was at least one more that I saw scurrying around that we have not yet caught/killed. I want them gone. I have done the 5 gallon bucket feeder and have it hanging. The ducks are just messy with how they eat and some invariably gets dropped on the ground. Removing the food source entirely is not an option. I am hesitant to use poison, as the ducks are curious, clever and will eat anything. Also, if the dog catches one and manages to eat it, I don't want him to be poisoned. I have seen a 5 gallon bucket method, but I can't see the ducks not trying to perch on it. Live traps? Liquid nitrogen? An army of trained wasps? I assume that since it's such a sweet deal for the rats, even if I kill the existing ones, I expect that new ones would want to move in. Can I start taping razor blades to the ducks toes?