"Something of use" is irrelevant to scientific validity. But nice try at moving the goal posts.
"And it's chickens that roost, not ducks."
As a farm boy who has raised both, I can guarantee you that ducks do indeed "roost", as do geese, guinea fowl, etc.
I've changed no goal posts, and the phrase is still “chickens come home to roost”, not ducks.
We both descend from a Great Great Great grandfather who carried his pet rooster with him during the Revolutionary War ~ one of Francis Marian's top three volunteers too ~ and went into every major battle in the Southern campaigns with that rooster. We think it has something to do with birds loving us. He and his father used to run a pheasant farm in Kansas/Nebraska, but gave it up when they moved to Oklahoma.