Because of their catatonic state, zombies have been unable to offer any personal testimony to augment scientific research. Therefore, all we know about zombies is based upon empirical evidence. A person infected with the zombie virus is transformed into a single-minded hunting machine, with all changes to bodily functions serving the zombie imperative: locate prey, capture prey and feed. Overall, the changes that take place in zombies are more limited than in vampires, and primarily affect the nervous system and the muscular/skeletal system.

A zombie's powerful sense of smell compensates for the weakness of their other senses.

1. Sight: due to degradation of their corneas, zombies suffer from severe myopia. In addition, they are colorblind.
   
2. Hearing: zombies go deaf within a few weeks of transformation.
3. Smell: zombies have even more receptor cells than vampires. If the wind is right, zombies can smell humans from as far as several miles away.