A Garden Capture

I was in the garden when I saw a puzzling something zig-zag past, closely followed by a hummingbird.  When the something landed, I saw that it was a dragonfly that had captured a butterfly . . . and was proceeding to eat it.
I have a fondness for dragonflies -- they eat mosquitoes, you know -- but I'd never, ever seen one nab a butterfly.
He (or she) stayed put as I got closer and closer . . . It was fascinating; two beautiful insects . . . The dragon fly, a sinister high-tech helicopter, the butterfly, a hapless damsel . . .
  Exquisite colors and patterns caught up in macabre dance of death.