One day in September at lower meadow of Slough Creek, I was hit by the buzzards of flying ants mating swarm. Bugs were all over in the air and on the water and trout kept gulping while it lasted. I was not ready for this sudden event and I did very poorly. Lower Slough is probably the toughest water in Yellowstone Park but also I didn't have right ant patterns. Sizes of these ants were not in general as queens were size 10 or 12 while males were size 20 to 24. I had to develop true imitations and head back to the creek while swarm would last. I came up with great patterns for both queens and males.