I still have not figured out zombie physiology.
My understanding is that the victim actually dies and then the actuating organism reanimates the nervous system. All other systems - circulatory, respiratory - remain dead, and the flesh begins to decompose. The nervous system is able to contract muscles to cause the zombie to lurch into mobility, and the optical, auditory, and olfactory nerves still carry information to the brain. The zombie's need to feed is an instinctual remnant.
Yet, the governors scientist says that zombies still 'starve', but at a slower rate - which indicates that they need to feed and are digesting their human prey. The next logical implication is that these zombies should be pooping. I know they aren't much into hygiene and personal grooming, so why aren't we seeing zombies walking around with bulging pant-loads of zombie excrement? Why aren't these walking corpses with pantloads engulfed in a cloud of flies and crawling with maggots? We should be know they are coming just from the buzzing of their flies and their fetid pioli smell.
...and STAY out of the WOOLWORTH's!!!!!!!!!