No bites while taking this photo! I was mostly just avoiding yard work. I get a patch of ants like this in a sidewalk crack by my house about once each year. They are tiny ants and the cluster (about the size of a dessert plate) is so dense, it looks completely motionless and is about the color of a mound of dirt. I was curious to see what the macro would show, and I was amazed at the amount of activity and color.
This is shot wide open at 1/30 second on a tripod at ISO 50. If I had been clever enough to bump up the ISO, I could have really stopped the action (maybe next year). Here's a detail at full resolution.