Note: I have spoilers for multiple games here, particular from observations on Outlast 2 and Resident evil 4 and 6.
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Okay, good? Lets begin.
So, I was watching Markiplier's playthrough, and at one point he walks through a processing building filled with corpses, and has a pile of bodies and a dead horse on top- complete with saddle. Pretty sure other livestock were dead as well.