Robberfly with captured wasp

It was an impressive event to witness this mid-sized robber fly intercept and kill a fairly large yellowjacket. It took off very soon after I managed to get this picture, so unfortunately it's a bit blurry.

Altadena, CA. 10 viii 2008

Keywords: Asilidae, California, insect, predation, robber fly, Vespidae, yellowjacket