Arctia plantaginis

Distinguished from similar tiger moths by the combination of black forewings with ivory-yellow bands and the distinctive hindwing coloration: yellow or white with black banding in males, red with black base in females. The wood tiger moth is notably polymorphic in male hindwing color, whereas related species typically show less variation. The irregular, often interrupted marginal band on the hindwing and the presence of submarginal spots help separate it from Arctia virginalis and other Arctia species. In North America, the subspecies A. p. macromera can be distinguished by geographic range from the Eurasian nominate subspecies.

Occurs in slightly moist environments including meadows with nearby streams. Adults frequently found near lupine stands (Lupinus spp.). Occupies montane and lowland habitats across its broad range, from alpine regions to lower elevations. Found in diverse vegetation types across northern latitudes where suitable moisture conditions and larval host plants occur.

Holarctic distribution spanning northern Eurasia and North America. In Eurasia: from northern Europe south to Anatolia, Transcaucasus, northern Iran, Kazakhstan, Mongolia, China, Korea, and Japan. In North America: from Alaska to Manitoba, south through the Rocky Mountains to southern New Mexico, with isolated populations in Arizona and the Sierra Nevada mountains of California and Nevada. Alpine populations in Italy, Austria, and Switzerland show high gene flow with little genetic differentiation.

Polyphagous as larvae, feeding on diverse plant species. Caterpillars feeding on ribwort plantain (Plantago lanceolata) sequester iridoid glycosides for chemical defense. Adults are capital breeders and do not feed.

• Plantago lanceolata - larval hostsource of iridoid glycosides for chemical defense
• Lupinus - adult associationadults frequently found near lupine stands
• Aconitum - larval food in captivitypossibly toxic; may impact development
• Larix - larval food in captivitylarch needles used in laboratory rearing

Complete metamorphosis with egg, larva, pupa, and adult stages. Larvae undergo multiple molts; molting frequency increases under predation stress. Development time from egg to adult approximately 72–83 days under laboratory conditions, though this varies with environmental conditions. Larval diet significantly influences adult fitness due to capital breeding strategy where adults rely entirely on resources acquired during larval stage. Pupal mass in females correlates with lifetime egg production.

Exhibits aposematic coloration as primary antipredator defense. When threatened, adults perform death-feigning behavior: dropping to ground, assuming rigid posture with folded legs, where disruptive coloration provides camouflage against soil substrate. Can secrete target-specific chemical defense fluids: abdominal fluids deter ants, thoracic fluids deter birds. Flight activity differs between color morphs: white males more active with longer sustained flight periods; yellow males most active during peak female-calling periods. Larvae show predator-induced plasticity, developing more melanized warning signals when exposed to simulated predation.

Serves as prey for birds (notably blue tit Cyanistes caeruleus) and ants, functioning as part of predator-prey interaction networks. Larval herbivory contributes to plant-insect interactions; sequestration of plant secondary compounds links trophic levels. Aposematic coloration may contribute to predator learning and community-level signaling dynamics. Polyphagous feeding habits connect multiple plant species to higher trophic levels.

Used extensively as a model organism in evolutionary ecology research, particularly for studying aposematism, predator-prey coevolution, sexual selection, immune function trade-offs, and thermoregulation. Research on this species has advanced understanding of how multiple selective pressures maintain genetic polymorphism in natural populations. No significant economic importance as pest or beneficial species.

• Arctia virginalisSimilar common name (Ranchman's tiger moth) and appearance; distinguished by geographic range (western North America), different population dynamics driven by precipitation, and lack of male hindwing color polymorphism
• Arctia menetriesiiRelated tiger moth in same genus; much rarer, not attracted to light, not nocturnal, flies reluctantly; distinguished by behavior and extremely limited distribution (Finland and Russian Far East)
• Arctia cajaGarden tiger moth with similar aposematic patterning; has more extensive white spotting on forewings and different hindwing coloration pattern

• aposematism
• polymorphism
• predator-induced plasticity
• capital breeding
• chemical defense
• thermoregulation
• sexual selection
• immune trade-offs
• model organism
• Holarctic

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Rick Karban and the Wooly Bear Caterpillars of Bodega Bay | Bug Squad
• Nota Lepidopterologica | Blog - Part 2
• Nota Lepidopterologica welcomes new Editor-in-Chief Marcin Wiorek
• Academic journal | Blog
• open access | Blog
• Predator-Induced Plasticity on Warning Signal and Larval Life-History Traits of the Aposematic Wood Tiger Moth, Arctia plantaginis