They fly in antiphase which is very impressive but I
forget exactly what it means.

Most of the stronger insect fliers have evolved means to link their
forewings and hindwings in flight so that each side functions as one
flight surface. Dragonflies and damselflies, in contrast, move the two
pairs independently, timing the stroke of the hindpair so that they
meet the oncoming air before it has been disturbed by the front pair.
Physicists would describe them as operating in antiphase.

Source: http://www.geocities.com/cyberfly271...agonflies.html

Jim
Zone 8a - Dallas, Texas
Pond, Veggie Filter, Pond Maintenance & Pond Tour Pics:
http://community.webshots.com/user/dallas75248