Reference for Shabbat 18:2
חֲבִילֵי קַשׁ וַחֲבִילֵי עֵצִים וַחֲבִילֵי זְרָדִים, אִם הִתְקִינָן לְמַאֲכַל בְּהֵמָה, מְטַלְטְלִין אוֹתָן. וְאִם לָאו, אֵין מְטַלְטְלִין אוֹתָן. כּוֹפִין אֶת הַסַּל לִפְנֵי הָאֶפְרוֹחִים, כְּדֵי שֶׁיַּעֲלוּ וְיֵרְדוּ. תַּרְנְגֹלֶת שֶׁבָּרְחָה, דּוֹחִין אוֹתָהּ עַד שֶׁתִּכָּנֵס. מְדַדִּין עֲגָלִין וּסְיָחִין בִּרְשׁוּת הָרַבִּים. אִשָּׁה מְדַדָּה אֶת בְּנָהּ. אָמַר רַבִּי יְהוּדָה, אֵימָתַי, בִּזְמַן שֶׁהוּא נוֹטֵל אַחַת וּמֵנִיחַ אַחַת, אֲבָל אִם הָיָה גוֹרֵר, אָסוּר:
Bundles of straw or bundles of wood or bundles of z'radim [moist tree shoots, cut for animal food] — if one had prepared them as animal food, they may be moved; if not, they may not be moved. A basket may be inverted for chicks, so that they can go up or go down. [And this is not considered voiding a vessel from its function, for the chicks do not remain standing on it. And according to the view that a vessel may not be moved except for the sake of another vessel that may be moved, the Mishnah is to be understood as speaking of an instance where the place of the vessel is needed.] A hen that ran away (from the house)] may be pushed [with one's hands] until it re-enters. [And only pushing is permitted, but not pulling; for a hen lifts itself from the ground, so that (by pulling) he will be found to have moved her. But geese and other birds may be pulled.] Calves and colts may be pulled in the public domain [by taking hold of their neck and sides and dragging them and assisting them and moving their legs]. A woman may pull her son. [She holds him by his arms from behind, and he moves his legs and walks.] R. Yehudah says: When is this so? When he picks one leg up and puts one down; but if he drags them, it is forbidden. [For then, she lifts him. Whenever R. Yehudah says "When is this so" in the Mishnah, he is not differing but explaining the words of the sages. Therefore, the halachah is in accordance with him.]