Originally Posted by Mark$man
You forget this is fan fiction. Walkers have lasted for many months, and in the comics, over a year now.
I think it was actually 2 years, or maybe I'm just remembering it wrong. Either way, if we also go on the assumption that nearly the entire human race has become walkers, we're talking 6 billion corpses against the wild kingdom. That is certainly a scenario where strength in numbers truly matters. Animals must sleep, and the dead never rest... it's a war of attrition.