We were looking at the giant peony flower under our front window today and observed the buds to be teeming with ants. Ants are attracted to the sugary moisture exuded by the plant. An old gardeners tale suggests that ants are essential for peonies to bloom (they are not). I expect the ants also keep other nuisance insects like aphids away.
All of this led to a general discussion about how ants really own the world, not us. Be sure to check out the photo gallery too.