What somewhat bothers me in this serie, is the unrealism. Well, that kind of zombies are not possible anyways, so you better not question the whole concept, but still. Those fucking zombies keep going, even those are the easiest food for insects (like maggots), and not to forget any bigger predators. Any predator starting from foxes would be eating those piecemeals.
In reality maggots alone would eat those zombies in a matter of months, assuming it is not winter.
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