Reference for Shabbat 256:9

תרנגולת מאי טעמא לא אמר אביי משום דמקפיא נפשה

IF A FOWL RUNS AWAY. We may only push [it], but not make it walk. We have here learnt what our Rabbis taught: An animal, beast, or bird may be made to walk in a courtyard, but not a fowl. Why not a fowl? — Said Abaye, Because she raises herself.<span class="x" onmousemove="('comment',' But ducks when held by their wings actually walk. ');">⁹</span>

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