I found these black and yellow mud daubers in tall grass in my backyard around 10-15 wasps are roaming at the same place, as per my observation these wasps will sleep by holding this grass on both sides at night. It will go for hunting the food in the early morning.
The Mud Dauber wasps are medium to large-sized and are either shiny black or metallic blue-black with slender abdomens. They get their name from building their nests out of the mud. Mud Dauber wasps build finger-like nests of mud that are attached to flat or vertical surfaces. The mud is molded into cells by the wasp’s mandibles. Their nests are usually built-in sheds, barns, and other structures.