Mud dauber (sometimes called "dirt dauber," "dirt digger," "dirt dobber," "dirt diver", or "mud wasp") is a name commonly applied to a number of wasps from either the family Sphecidae or Crabronidae that build their nests from mud. Mud daubers are long, slender wasps about 1-inch (25 mm) in length; the latter two species above have thread-like waists. The name of this wasp group comes from the nests that are made by the females, which consist of mud molded into place by the wasp's mandibles.
Paper wasps are beneficial insects. They feed on many insect pests. However, they can and do sting when disturbed, which can be a problem if a nest is touched by someone doing pruning or fruit picking, or if there is a lot of human activity near a nest.
Fleas are the most common transmitter of the rare Bubonic Plague. Their saliva can cause serious Flea Alergy Dermatitus in pets, and reported to cause similar allergic reactions in humans. Fleas can also transfer tapeworms and cause anemia in pets. Flea bites commonly cause painful, itchy red bumps.