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Regarding your question on animals becoming zombified.
Interesting.
In Day of the Dead there is a brief scene with a crocodile on some steps with some zombies taking no notice of it, wether this means that the animal was already zombified or that animals are immune i'm not sure, but the surrounding undead non reaction to a possible meal could mean two things. Either it was infected or the undead had learned enough about the nature of crocodiles not to attack it.
In The Resident Evil series there are various animal zombifications including Dogs and birds, but again it is not a clear cut case of animal zombification. The running story in the Resident Evil series involves the Umbrella Corporation infecting subjects directly via experimantation rather than the natural progress of an infection in the wild.
In the remake of Dawn of the Dead, a dog is lowered into a crowd of ravenous zombies in order to carry a roast beef sandwich to a starving survivor hiding in a shop across the car park. The undead take little notice of the dog as it is lowered past them in easy grabbing distance.
In the movie 28 Days Later there is a brief scene with a family of uninfected horses running wild and free in the countryside. Even though the Rage virus has already ravaged the human populace.
There are other examples of animal zombification in the history of zombie movies but off the top of my head I think that they involve infection through experimentation, I'm struggling to come up with one example of an animal catching the zombie virus through the natural progression of an infection in the wild.
I may be wrong but I think that evidence would suggest that animals do not catch the zombie virus in the wild. However human experimantation can result in an animal succumbing to zombification.
Am i a nerd?