sort of been done before and this one is a bit too clear-cut: there's absolutely no twist to it. it's just two identical ducks and a goose and you've gone as far as to spell it out for us that the bird is indeed a goose (as if we wouldn't know?)
I agree with GeeGee, even if the goose was turning around and yelling DUCK! and the other ducks were cowering under their feathers it would be a bit more interesting.
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