So on the avenue of the Giants (northern California, Aug 18th 2011) I find myself wandering in the trees and find a very pleasant stream. Then, by the rocks I see a ‘tarantula hawk’ type spider wasp dragging a paralyzed spider. Incredible beasties!
So the parasitic wasps find and paralyze the spider, then drag it back to a burrow they have made, and lay an egg on it, which then devours the paralyzed spider. Other than that, all I know about these wasps is they have incredibly painful stings, among the most painful stings of any insect.