Reference for Shabbat 256:11

הא גופא קשיא אמרת אין עוקרין אבל דדויי מדדינן הדר אמרת דוחין אין מדדין לא אמר אביי סיפא אתאן לתרנגולת

in a courtyard, but we may push them that they should enter. Now this is self-contradictory. You say, We may not carry, which implies that we may certainly make them walk; then you say, we may only push but not lead? — Said Abaye: The second clause refers to a fowl.

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