There are animals that can’t be tamed with food; IIRC only chickens and chicks (yellow or birdfowl) accept birdfood.
You can pick some fertilized eggs up and wait for them to rot completely, then they’ll hatch; you can then feed the chick so it becomes tame. But beware, ducks can move between z-levels; I tried to have a open-top duck coop, with results I should have predicted - they flew up a Zlevel and kind of flew away, haha.
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