could be smell
Pulled from my response to another thread,
• I think of zombies as homo- mortuus, a sub-species of homo-sapians. This distinction occurs as a result of an infection, of a yet unknown origin. (I think that the initial infection causes a gene mutation allowing for reanimation)
• Based on this assumption, I think that these creatures can and would evolve, thus leading to faster, stronger, more intelligent zombies. Due to the spread of infection I think that it is plausible that the rate of “bite mutation” could be has quickly as every three generations or iterations.