I think it may be something to do with the worms, note that Rick pulled up a bunch of worms from the ground and fed them to the pig...saying it gave them protein. Well they also bury the walkers out in the yard...not right near the garden and the pigs...but close enough. Worms travel through the underground...perhaps eating the buried walkers...feed the worms to the pigs...you eat the pigs....or any food grown where the worms are in the soil.....I'm jsu saying.
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