As mentioned, zombies do not eat other zombies. That means - in a worst case scenario for both zombies and humans (if they are all eaten) - that the food supply becomes finite with time.
Zombies, if they had a brain (hahaha), would try to overcome this dilemma, but they are driven by one need: Brains and more brains. Equally troublesome is that they do not appear to get full, and are constantly on the search for brains. This leaves them no pause to consider the circumstances of their problem. (A zombie is definitely not someone you'd want to be a stock portfolio analyst, or someone in charge of your investment capital.)
About toenails: My understanding is that toenails and fingernails continue to grow after death. Has anyone read any study on whether or not toenails continue to grow on zombies?
Yes, zombies do compete for the same meal. But let's look at the number of zombies currently shambling about: Do they know they are competing for the same food source? The fact that there IS more than one zombie (we can agree on this, right?) might suggest that zombies are not very accurate when they take a bite out of a human.
For example, if zombies propagate due to a mistake in biting some part other than the brain (and the person becomes infected), wouldn't this also suggest that the person bit has successfully escaped? Because there are so many zombies, doesn't this suggest that it is easy to escape from a zombie?
Don
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