Survival
Your skill in wilderness survival. This helps you butcher meat from a corpse and craft various basic survival items. High levels may allow you to remove poison from tainted meat. Also used for skinning corpses to acuire pelts. For a more efficient butchering you'll need this skill at level 3, dexterity at 8 and strength at 4 or higher.
Apart from reading books on the subject, you can easily raise this skill by butchering corpses (including those of zombies), examining undergrowth, crafting stone hammers and, later, digging sticks and snare triggers.
At level 3, it can detect if an food item is poisoned. At level 5, it can detect if food items contain hallucinogenics.