Quote:
Originally posted by fastpat
No, it's not this kind, but it looks like them. The ones I have are social not solitary, and their nest is paper not mud. That's what makes them so unusual.
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I'm pretty sure those are Blue Mud Wasps. Do you have many black widow spiders around? That's the food source for their young.
As for the social behavior you observe (Are you sure they built the nest you're seeing them on?), from the second link: >>"Sleeping" aggregations (see Behavior) may also be part of the mate-finding process (Bohart and Menke 1976).<<
and: >>Sometimes this species is found in groups, sheltering during the night or during bad weather (Bohart and Menke, 1976).<<