In Iowa, there are more hogs than humans. While the human population is around three million, the hog population is 21.2 million!
This means that for every one human, there are four hogs.
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Given the way my parent's farm smells (which is hog free), the 4:1 ratio sounds low. And don't get me started on the chickens...wow, can those little things stink up a large area.