Feral Pigsies will spawn on Detritus in Jungle-biomes, but can also be found in Swamplands occasionally, not far from the Jungle. They are aggressive creatures that will attack your player-character when spotting him/her, and can inflict poison damage. Feral Pigsy Fur is needed as an ingredient for a number of crafting-recipes, like for Iron Swords, Iron armor, Armor-Piercing Bombs, Poison Bombs, Bungalow Fur Walls or Bungalow Accent Walls (as of R26 in December 2015). They are not needed to craft Poison Resistance Potions though.