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Distinctive mud chambers built by this wasp that preys on spiders. Multiple spiders are placed in each chamber for the larval wasp to feed on.
This nest was on a maple tree in a yard with forest all around.
It's unusual to see one of these nests in such an exposed location. It was very easy to see especially being built on the white lichen growing on the tree trunk.
Spotted on Jul 18, 2020
Submitted on Jul 18, 2020