Person(s) who have recently died become reanimated in only a matter of minutes; in all cases they kill for one reason; to feast only upon warm flesh of the living, though it can take no nourishment from what it ingests. These creatures cannot be described as humans. They don't need any blood flow; don't need any of their internal organs. They use about five percent of the food available on the human body; with that small amount, the body is usually intact enough to be mobile when it revives. On revival, the rate of decomposition slows substantially. Indications are that these beings could function over a period of years; in cases of early revival, to years before decay would threaten mobility. The brain is the engine; the motor that drives them. Apparently they have decay in the frontal, parietal, temporal and occipital lobes. Decomposition occurs first in the frontial lobes, the neocortex, and next the limbic system, the middle brain; but the core is the last thing to be attacked by the decay. They transmit electrical impules strong enough to animate what little remains of the body's muscle tissues. They do not prey on each other. Every dead body that is not exterminated becomes one of them; the people(s) it kills get up and kill. Intelligence; seemingly little or no reasoning power, but basic skills remain a more remembered behavior(s) from normal life. These creatures use tools, but even these actions are the most primitive; the use of external articles is blugend and so forth. These creatures are nothing but pure motorized instinct; a deep dark primordial instinct; the central bit of prehistoric stuff we inherited from the reptiles. They can't keep their eyes off of fireworks. A ghoul can be "killed" by a shot in the head or a heavy blow to the skull, ultimately either by destroying the brain or severing the brain from the rest of the body. Since the brain of a ghoul has been activated by the radiation; kill the brain and you kill the ghoul. Some of them had developed the power to think; to reason, in the most primitive way.