Based on the provided reference, "mud robber" is likely a misinterpretation or variant name for mud dauber, a type of wasp.
Here's a breakdown:
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What they are: Mud daubers are generally long, slender wasps, often about 1 inch (25 mm) in length.
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Nest Building: The name "mud dauber" comes from the nests that the female wasps build. These nests are constructed from mud, which the wasp molds into place using her mandibles (jaws).
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Temperament: Mud daubers are typically not aggressive. However, they can become defensive if they feel threatened.
Therefore, while the term "mud robber" is not a standard or common name, it likely refers to the mud-collecting and nest-building behavior of mud dauber wasps.