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Asian Giant Hornet (Vespa mandarinia)


Detailing the physical features, habits, territorial reach and other identifying qualities of the Asian Giant Hornet.




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 Updated: 8/26/2020; Authored By Staff Writer; Content ©www.InsectIdentification.org




The world’s largest hornet, the Asian Giant Hornet is native to Japan, but has established itself in nearby countries like Thailand, China, Nepal, and Russia. In 2019, its first known arrival to the North American continent occurred in British Columbia and adults have been found in Washington. Sometimes referred to as a ‘Murder Hornet’ in North America, it has a powerfully painful sting that has caused approximately 40 deaths per year in Japan according to a researcher (Yanagawa) at the National Defense Medical College in Japan. That is fewer than the number of annual deaths seen in the U.S. from bees, and the use of the ‘Murder Hornet’ moniker is discouraged. Those allergic or sensitive to venom are not the only ones that experience serious effects, so the health risk is high for any person stung by it because this large hornet is able to inject a greater volume of venom per sting than smaller hornets and bees. The recovery time for those stung by the Asian Giant Hornet is much longer than any North American bee or hornet requires, and hospitalization may be necessary to manage the body’s reaction to the venom. Scars may develop at the sting sites. (ref: University of Florida Entomology and Nematology, May 2020)

Nests are built in the ground, usually in abandoned rodent burrows, and stinging encounters occur when a person unwittingly steps on or near the nest’s opening. The defensive reaction by the hornets is aggressive and intense. For this reason, hunting down the nests is hazardous work. In winter, only queens remain in the nest and they leave it in spring to search out a new nest home to build a new colony. A queen will raise the first group of workers, feeding on tree sap. Over the course of the next 4-6 months, the size of the population grows to almost 100 hornets in a nest. Once males are bred and mate with the queen, most inhabitants leave or die, and the population diminishes until only overwintering queens are left.

While new queens feed on tree sap in early spring, eventually workers seek out insect prey and by the end of summer, honeybees are the preferred food source. This dietary shift can result in monumental problems for agriculture as the honeybee is a critically important pollinator in North America. In a mid-air attack, the large hornet kills a honeybee and takes only its thorax back to the nest as a meal. If a honeybee hive is near a hornet nest (within 8 km or 5 miles), it may experience an attack at the hive. If more than 3 hornets attack a hive at one time, the hornets stay all day, dismembering as many bees as they can and will return daily to continue to slaughter and consume the hive’s population, including bee larvae and pupae. (ref: Penn State Extension, 06 May 2020). Stinging encounters occur among people approaching a commandeered beehive. Conventional bee suits are ineffective at stopping the long stinger from penetrating it and thicker, more specialized gear is necessary to safely approach a nest of hornets or infiltrated beehive.

Efforts aimed at controlling and eliminating the Asian Giant Hornet are already underway in the Pacific Northwest. These include the use of chemical insecticides and poison baits, as well as traps and screens to help protect beehives. If sightings of this hornet are made in the Pacific Northwest, do not approach a suspected nest and leave the area immediately. In the eastern and southern part of the continent, this hornet is often mistaken for the European Hornet, an Eastern Yellowjacket, or a Southern Yellowjacket. The Asian Giant Hornet can grow to be over 5 cm (2 inches) long. Size alone is a fast way to narrow down the identification of it, but it should not be the only characteristic used to confirm what it is. The Asian Giant’s head is wide and the face is matte orange-yellow. A plate between the eyes has a scalloped or ruffled bottom, but do not approach a live specimen to verify this. Antennae are medium brown with yellow bases. A large mandible (jaw) has black tips. The thorax, or middle section, is dark. Wings are a smoky gray color. The abdomen is brown with straight orange-yellow bands, lacking any tear-drop or arrowhead designs. Legs are brown. Only females have a stinger, and it is narrow and almost 1 cm ( 0.4 inches) long. Contact the Invasive Species Council of British Columbia or the provincial government in Canada, or the Washington Department of Agriculture or county extension in the U.S. if a hornet sighting is made in these areas.


General Characteristics
Capability, Shape, Texture/Pattern, Benefits, Dangers
Flying insect icon
Insect stinger icon
Striped or banded insect icon


Taxonomic Hierarchy
Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Hymenoptera
        Family: Vespidae [ View More ]
          Genus: Vespa [ View More ]
            Species: mandarinia
Identifying Information
Size, Colors, Descriptors
Scientific Name: Vespa mandarinia
Other Name(s): 'Murder Hornet'; Sparrow Hornet
Category: Bee, Ant, Wasp and Similar
Size (Adult; Length): 40mm to 51mm (1.56in to 1.99in)
Colorwheel Graphic Colors: black; yellow; orange; red
Descriptors: large; huge; enormous; stinging; flying; painful; banding; invasive
Relative Size Comparison
Lo: 40mm | Hi: 51mm
Territorial Reach (A-to-Z)
U.S., Canada, and Mexico
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delaware
Florida
Georgia
Hawaii
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Illinois
Indiana
Iowa
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Louisiana
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Maryland
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Michigan
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Mississippi
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Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington
West Virginia
Wisconsin
Wyoming
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Alberta
British Columbia
Manitoba
New Brunswick
Newfoundland and Labrador
Nova Scotia
Ontario
Prince Edward Island
Quebec
Saskatchewan
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Mexico
Note: An insect's reach is not limited by lines drawn on a map and therefore species may appear in areas, regions and/or states beyond those listed above as they are driven by environmental factors (such as climate change), available food supplies and mating patterns.
Territorial Map
U.S., Canada, and Mexico
Alaska  
Hawaii  
Prince Edward Is.  
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Ant, Bee, and Wasp Anatomy
Graphic showing basic anatomy of both a bee and an ant insect
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Antennae: Ants and Bees both have a pair of antennae on the head that senses their surroundings.
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Head: The head contains the insect's compound eyes, antennae, and mandibles.
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Thorax: Contains various vital parts such as the aorta and nervous system.
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Abdomen: Contains various organs including the heart, gut, venom glands, and anus.
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Legs: Ants and Bees have three pairs of legs attached to the thorax (center-body section).
NOTE: Ants, Bees, & Wasps are part of the Hymenoptera order because they share many similarities.