Funny thing. Mine are actually too stupid to come in at night and I don't have a pond. They are smart enough however to wait for me to put them to bed at night where they and I know they will be safe. I did see a really neat picture somewhere on BYC of a guy that had a large pond. He had a sort of ramp from the duck pen to the pond. At night he went out in a Kayak and rowed them back up the ramp into their pen. Wish I had a pond that size. I would get all sorts of exercise and my ducks would love it as well.Well, if mine are too stupid to come in at night they're on their own. I'll do as best I can to shoot any varmints I see, but I certainly don't plan to stand guard every day over them and try to herd them in at night.