the infected have the ability to detect and differentiate smells between the living and the dead.
darkness seems to have little effect on infected senses at close range, and in areas devoid of light
they can still find their way around as they would in the day. individual strength depends on the
physical makeup of the host and on how long they have been reanimated. when attacking, the
infected often become more lively, exhibiting full-body effort, and can produce enough force to
quickly overwhelm an adult.
the infected feel no pain and are not deterred by it. although slow and seemingly unintelligent
when not active, they can react quickly to sufficient stimulation, and can rapidly overpower a
victim they have taken by surprise. though their bodies are no more or less durable than a
non-decomposed human body, they can absorb all manner of physical damage, even when badly
decomposed. anything other than a head attack or spinal cord severance leaves them seemingly
unfazed. as long as their brain remains intact, everything that is attached to the brain can continue
to function as normal, even if only the skull remains and is severed from the body. the bodies of
the infected don't decompose like regular human corpses, taking far longer.
other than a mostly intact brain, infected don't appear to require any vital systems or organ
functions to survive, although their ambulatory functions do decrease as their level of decomposition
increases. sufficient physical damage can slow them down, or render them incapacitated. infected
don't require sustenance by eating. a reanimated body responds to stimuli such as light, smell, and
noise. though infected retain a physical resemblance to the living, cognitive similarities are almost
non-existent beyond low-level functions. they have enough intelligence to walk upright, to use
their bodies to break objects, and to climb around or over somewhat small obstacles such as
chain-link fences. infected can ascend and descend staircases, albeit very clumsily and slowly. they
cannot generally operate doors or gates and tend to bash through obstacles or at least try to.
mostly, infected are void of any emotional expression and thought. when stimulated, whether by
noise, sight of prey, or simply encountering a problem they cannot solve, such as being unable to
open a locked door, they quickly descend into a state of murderous aggression. if they spot prey
when stimulated, they can pursue them ceaselessly, showing ravenous hunger. infected are not
hunters, however, and take no concern in alerting their victims or trying to hunt them with intelligence,
always seeming to roar, grunt, and growl whenever they are on a hunt - they lack speech capabilities.
infected are not shown to be able to communicate with others by any means, though they will
frequently copy the actions they witness other infected perform, such as bashing on a door or moving
in a group, eventually forming a herd.