תלמוד על שבת 255:9

It was stated⁴²Babli 128a, Tosephta 14:8 (ed. Liebermann).: “One may move mustard seed because it is pigeon feed, and rue⁴³Gaonic identification (Gaonic commentary to Kelim 3:6). because it is food for gazelles, and glass⁴⁴Glass beads. because it is food for ostriches. Rebbi Nathan said, then one should be able to move shoots since elephants eat them⁴⁵Since Mishnah 2 explicitly prohibits moving bundles of shoots which are not intended as feed for domestic animals, the entire argument based on the feeding habits of wild animals is unacceptable. In the Tosephta he adds a principle: One may move potential food if and only if it was intended either as food or as feed.”.