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The wormer that's listed as toxic to geese is niclosamide. -Kathy

You're welcome! There's also a wormer that's toxic to geese, but I can't remember the name, and there's a combo of two wormer drugs that are toxic to chickens, so probably best to avoid those in ducks. The good news is that none of the ones I'm thinking about aren't common, so probably no need...

First one is nitarsone, it's used in chickens, turkeys and gamebirds to prevent blackhead (histomoniasis). Also toxic to dogs and geese. -Kathy