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a great photo ...!
What bees do you think it was parasatizing ?
They are leaf cutter bees.
Really great photo - well done :). Is his a crop from a larger image?
I have another picture (which I'll put up) with most of it in but it was a bit blurry as it kept waving its tail about.
is a possibility, I have collected it in this situation, parasitising hole nesting hymenopterans
Lat/Lng: 51.9179, -1.1433
OS grid ref: SP590247