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→Probability of Organ
Provided you don't botch the butchering attempt altogether, you get a 3% chance of an organ for every 9 levels (rounded down) of the relevant [[Anatomy]] skill, plus any item bonus. If you receive an organ, it is selected at random from the possible organ drops for that mob.
Example: If you have a level 45-53 anatomy skill and Amutasa's +7% organ knife, you would have a 5*3+7 = 22% chance for an organ. Say you are butchering a [[barghest]]. Barghests have five different organs (stomach, brain, heart, spleen, tier-4 animal fat) so if you get an organ from one, you have a 1-in-5, or 20%, chance of getting a fat. That amounts to a 22%/5 = 4.4% chance to get fat from a Barghest.
===Butchering tools===