You all have me confused now. They DO have an umberella nest. My son WAS stung. It did NOT hurt at the time of the bite or any time afterwards. They are defensive of their nest and certainly faced me and warned me off when I shoved 67mm of Skylight filter in their face. A few (never all) faced me and began buzzing their wings, which is why you can see the wings of the "egg tenders" but not of the 2nd guy who was trying to stare me down. I am quite colour blind and I have used the "vivid" option in my D80 to punch the colour up in these shots; but I was most surprised to see just how colourful these little critters are. Before photographing them they were just grey insects that floated round my barbie area. I studied these guys for some months; until they deserted the nest. Here's a fuller piccie of the nest which I initially excluded because the extremely shallow depth of field meant that I could not get complete focus.
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