Here is another of those genre-crunching question, but we’ll tackle it.  Assuming an apocalypse in which the zombies are caused by a virus and noting that, generally, animals are not usually harmed by human diseases, it is probable that graboids would have a field day.  Lumbering noisy zombies would be very easy prey.  Once shriekers emerged, they’d have hordes of zombies to eat and, with virtually unlimited food, would proliferate astronomically.  So a zombie apocalypse would quickly become an shrieker apocalypse, and then an AB apocalypse.  Presumably, any remaining humans who had been fighting zombies would have no chance at all.

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