Not super-relevant (since I'll be interjecting content from something other than The Walking Dead), but in Brooks' "Zombie Survival Guide" the story is that the virus that reanimates the corpses also acts as a repellent to the common bacteria, insects, animals, etc, that would normally feed on (& aid in decomposition of) the body. So the rotting occurs much more slowly.
I kind of like that theory, so that's the one I use when I'm in these "type" of conversations.
On a semi-related note, my bro (police officer) showed me a photo of a deceased individual who had been found in the woods (out in the elements here in FL), & he asked me to guess how long the person had been dead. I thought it HAD to be AT LEAST 8 months, cuz there was literally almost nothing left (& most of it looked to have been just decomposition, as opposed to animal feeding). I was FRAKKING SHOCKED when he told me it was just under 2 weeks.
