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Polistes dominula
It was a really hot day in LA and these wasps were beating their wings rapidly to cool down their nest !
Please consider adding this spotting to the Animal Architecture mission at http://www.projectnoah.org/missions/8082...
They look so similar to my unknown spotting:
http://www.projectnoah.org/spottings/139...
In my place they seem to build nest by digging into sand.
I don't think I have seen that kind of nest before Are you sure they are not hornets or Yellow Jackets?