Background: Along with olfactory stimulants, pheromones stimulate the VNO Organ (Vomeronasal organ) which is a tiny, centimeter long organ, that is responsible in influencing pig behavior. This organ sits within the mucous membrane that covers the septum, the cartilage that divides the nostrils. Scientists have found that the VNO acts as the receptor for a sensory system that is separate from smelling. The VNO also connects directly with the hypothalamus, the brain’s control center for basic drives like fear as well as for body temperature and heart rate.