Vespa mandarinia

Distinguished from all North American wasps by its exceptional size (3.5+ cm), large orange-yellow head contrasting with dark thorax, and broad orange and dark brown abdominal bands. No native Vespa species occur in North America. The European hornet (V. crabro) is smaller with reddish rather than orange coloration. Many misidentifications involve cicada killers, yellowjackets, and European paper wasps, which are substantially smaller.

Adults measure approximately 3.5–5.0 cm in length, with queens reaching up to 5 cm. The head is large and orange-yellow with prominent compound eyes. The thorax is dark brown or black with a velvety texture. The abdomen alternates between dark brown/black and orange/yellow bands. The wings are large, dark brown, and folded longitudinally at rest. The stinger is longer than that of honey bees and can deliver venom repeatedly.

Temperate and tropical low mountains and forests; nests in ground cavities including mammal burrows, decayed root cavities, spaces under overhangs, and wall voids. Well-adapted to Pacific Northwest conditions with dense forest biomass.

Native to eastern Asia: India, Sri Lanka, Bhutan, Nepal, Myanmar, Thailand, Laos, Vietnam, Malaysia, China, Hong Kong, Taiwan, eastern Russia, Korea, and Japan including Ryukyus. Introduced to North America with detections in British Columbia, Canada and Washington State, USA.

Queens emerge from overwintering in early spring (April–May). Workers most visible in August and September as colony size peaks. Late summer and fall is the period of highest aggression when colonies attack honey bee hives and produce new queens and drones.

Feeds primarily on larger insects, especially other hymenopterans. In spring, forages individually for large insects, tree sap, and honeydew. In late summer and fall, shifts to coordinated group attacks on honey bee colonies, entering a 'slaughter phase' where workers kill bees by decapitation and occupy hives to feed brood to their own larvae.

Annual eusocial colonies founded by single overwintered queen. Complete metamorphosis: egg, larva, pupa, adult. Queen initiates nest and rears first worker brood alone. Colony expands through summer, potentially reaching 700+ workers. Larvae produce rhythmic rasping sounds by rubbing mandibles against cell walls, calling continuously regardless of light or time including nocturnal calling. Reproductive phase in late summer produces virgin queens and drones; new queens mate and overwinter while original colony dies.

Social wasp with annual colonies. Moderate defensiveness when foraging in spring; highly aggressive defense of nest if disturbed. Late summer colonies become very aggressive during honey bee hive attacks. Queens are strong fliers capable of 20 miles per day. Workers use pheromones to coordinate mass attacks on bee colonies.

Top invertebrate predator in native range, regulating populations of other large insects. Invasive threat to honey bees and native pollinators in Pacific Northwest. Can decimate honey bee colonies in hours, with potential cascading effects on pollination services.

Severe threat to beekeeping industry and agricultural pollination. Venom is highly toxic (4.1 μl per wasp) with potential for tissue necrosis and fatal reactions from multiple stings. Stinger longer than honey bee and can sting repeatedly. Larvae and pupae consumed as food and used in traditional medicine in Asia. Subject of intensive monitoring, trapping, and eradication efforts in Washington State.

• Vespa crabroEuropean hornet is smaller (2.5–3.5 cm), has reddish-brown rather than orange-yellow head, and less contrasting abdominal banding; established in eastern US but not major honey bee threat
• Sphecius speciosusCicada killer wasp has rusty-colored wings, more slender build, distinct pale yellow markings, and is solitary rather than social
• Vespula speciesYellowjackets are markedly smaller (1.2–1.6 cm), have brighter yellow and black patterning, lack large orange head, and are scavengers rather than specialized predators of live colonies

The media term 'murder hornet' is rejected by entomologists; the species is no more likely to sting humans than honey bees and honey bee venom is considered worse by experts. The hornet does not pose immediate existential threat to all North American bees; detections remain limited to small area of Pacific Northwest with ongoing eradication efforts. The commonly cited 'two-inch' size represents maximum queen size, not typical specimens which measure approximately 1.5 inches.

• invasive species
• honey bee predator
• social wasp
• pest
• venomous
• Pacific Northwest
• quarantine
• apiculture threat
• largest hornet

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
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