Not knowing where else this might fit, I thought I'd try here. So, I came across a HUGE bunch of lady bugs on one of my fence rails today. Hundreds of them. They had a few aphids with them, too. Since the fence rail is made of kiln-dried 2x4 lumber and I assume has little nutritional value for either the lady bugs or the aphids, here's my question: Do the lady bugs move their aphid "herds"?