10THEY'RE ATTRACTED TO SOUNDS
Soon after the dead rose and began to feast upon the living, those who survived picked up on a key feature, which helped them to survive. The dead respond to sounds more so than visual stimulation or even physical touch. This was especially true of zombies whose eyes were no
longer present or functioning.
Moving quietly among the dead is important if you want to survive, and firing off a gun is especially dangerous. This is one of the main reasons the survivors get in close with clubs, swords, hatchets, and other similar weaponry. Killing a few at close range is preferable to being surrounded by hundreds.