Bees in The Clover

I stepped on a bee today after running about an hour at Holmdel Park. Got stung on my arch area. It didn't really hurt that much. I was close to my car and had an ice thing in my cooler, so i put that on there for about 10 minutes. Then I ran another half hour. I knew I was running over lots of clover, and saw plenty of bees, but easily avoided most - they were easy to pick out from their movement and color. I guess our vision may be naturally selected for that.