Mud dauber

wasp nest, showing different muds gathered from different places The organ pipe mud dauber, one of many mud daubers in the family Crabronidae, builds nests in the shape of a cylindrical tube resembling an organ pipe or pan flute. Common sites include vertical or horizontal faces of walls, cliffs, bridges, overhangs, shelter caves, or other structures. The nest of a black and yellow mud dauber species Sceliphron caementarium (family Sphecidae) is a simple, one-, two-, or sometimes three-celled, cigar-shaped mass that is attached to crevices, cracks, and corners. Each cell contains one egg. Usually several cells are clumped together and covered in mud. The blue mud dauber species Chalybion californicum, another sphecid, builds mud nests, but occasionally refurbishes the abandoned nests of other species. Its larvae are fed spiders; adults consume nectar. The two species commonly occupy the same barns, porches, or other nest sites. All mud daubers may occupy the same sites year after year, creating large numbers of nests in protected locations; such sites are often used as nest sites by other kinds of wasps and bees, as well as other types of insects. One disadvantage to making nests is that most, if not all of the nest-maker’s offspring are concentrated in one place, making them highly vulnerable to predation. Once a predator finds a nest, it can plunder it cell by cell. A variety of parasitic wasps, ranging from extremely tiny chalcidoid wasps to larger, bright green chrysidid wasps, attack mud dauber nests. They pirate provisions and offspring as food for their own young. ==Food==

Like most other solitary wasps, mud daubers are parasitoids, but unlike the majority of parasitoids, they actively capture and paralyze the prey upon which they lay their eggs. The females build the nests, and hunt to provision them. Males of pipe-organ mud daubers have been observed bringing spiders to the nest, and nest-guarding, an extremely rare appearance of male parental care, otherwise virtually unknown among Hymenoptera. Black and yellow mud daubers primarily prey on relatively small, colorful spiders, such as crab spiders (and related groups), orb weavers and some jumping spiders. They usually find them in and around vegetation. Blue mud daubers are the main predator of the black and brown widow spiders. The wasp often shakes the web pretending to be caught order to lure out the host spider. Adults of both sexes frequently drink flower nectar, but they stock their nests with spiders, which serve as food for their offspring. Mud daubers prefer particular kinds and sizes of spiders for their larders. Instead of stocking a nest cell with one or two large spiders, mud daubers cram as many as two dozen small spiders into a nest cell. To capture a spider, the wasp grabs it and stings it. The venom from the sting does not kill the spider, but paralyzes and preserves it so it can be transported and stored in a nest cell until consumed by the larva. A mud dauber usually lays its egg on the prey item and then seals it into the nest cell with a mud cap. It then builds another cell or nest. The young survive the winter inside the nest. ==Airplane incidents==

Florida Commuter Airlines Flight 65 On September 12, 1980, Florida Commuter Airlines Flight 65 crashed on a flight from Palm Beach International Airport to Grand Bahama International Airport, killing all 34 people on board. Before the flight, a mud dauber's nest was discovered in a pitot tube of the airplane which was cleaned by maintenance using an unapproved method. Although the NTSB could not determine the cause of the accident, one of the possible factors was the improper cleaning of the mud dauber nest from the pitot tube. Birgenair Flight 301 On February 6, 1996, Birgenair Flight 301, a 757 jet flying from Puerto Plata in the Dominican Republic, crashed into the Atlantic Ocean. All 13 crew members and 176 passengers were killed. A key part of the accident was a blocked pitot tube. Although the tubes were never recovered from the ocean floor, the plane had been sitting on the tarmac for 25 days with uncovered pitot tubes. Investigators believe a black and yellow mud dauber, Sceliphron caementarium, got into the tube and built its cylindrical nest inside, causing faulty air-speed readings that were a large part of the crash. Gulfstream N450KK On April 10, 2015, about 18:45 Eastern Daylight Time, a Gulfstream Aerospace G-IV, N450KK, was substantially damaged during a cabin over-pressurization event over the Caribbean Sea while en route to Fort Lauderdale, Florida. An initial examination of the fuselage revealed that the outflow valve safety port, located on the outer fuselage, was completely plugged with a foreign material resembling dried soil from a mud dauber. ==See also==