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Sphecius speciosus
This sighting: large (2-3 inches!) wasp-like insects buzzing around the trunk of an oak tree and feeding on sap. It's not often I see something in my neighborhood that I've never heard of before.
Suburban woodland
I'll try to get a photo if I see them again. I have to admit they intimidated me! Perhaps also some better images with my dSLR and macro lens too.