I was outside a while ago using the trimmer mower before getting out the rider . I ran over a Ground Hornet nest and got stung 7 or 8 times arm , hands , inner thighs ........ when they sting you , they leave a pheromone odor and can track you down . If I can pin-point their hole in the ground tomorrow , I will be leaving a present for them . I put some "Sting Eze" where they stung me but they still hurt !