I once had a yellow jacket type bee nest in a hole in the ground (found it while mowing the grass) , and it a wasn't pleasant experience. Curious as to if they would bother me after dark , i set a one gallon glass container over the hole and started stomping the ground around it , and they came out in the hundreds , ready to attack. So , mowing at night was not an option. I started using a pair of binoculars to look out across the yard for more of this pests and found a total of nine different nests within a week. The trick is to look toward a sunrise or a sunset to see them coming and going in and out of the ground.