Fauna
Insect

Rusty Tussock Moth

Orgyia antiqua

Also known as Vapourer, Vapourer Moth, Rusty Vaporer

Rusty tussock moths exhibit striking sexual dimorphism, pairing nimble, rust-colored males that fly in erratic daytime zigzags with stout, wingless females that never take flight. Upon emerging from her silk cocoon, the female remains stationary on the outer casing, emitting sex pheromones to draw males before depositing her entire clutch of eggs across the silk shell. The flamboyantly colored caterpillars wield dense dorsal hair tufts and twin black front pencils, browsing on foliage across a wide spectrum of forest and garden flora.

DimorphicDay-flyingUrticating Hairs
Rusty Tussock Moth reference1 / 7
(c) SteveM4560, some rights reserved (CC BY) · cc-by
—observations
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Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Key facts
Diet & preyBirch leaves, Willow foliage, Hawthorn leaves
Predators
  • Common cuckoo
  • Parasitoid wasps
  • Jumping spiders
ThreatsIndiscriminate pesticide spraying and extensive habitat clearance
HabitatsDeciduous woodlands, hedgerows, heathlands, moorlands, and urban parks
Life span1 year (adults live 5–14 days; larvae feed for 4–8 weeks)
Classification
  1. OrderLepidoptera
  2. FamilyErebidae
  3. GenusOrgyia
  4. SpeciesOrgyia antiqua
Range & activity
Range data is not available yet.
Safe observation
Interaction riskLow
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is low
Caterpillar setae cause itchy contact dermatitis; avoid touching the larvae or their hairy cocoons.
Why it is dangerous
Barbed larval setae contain urticating histamine-releasing compounds that trigger localized rashes, severe itching, and dermatitis upon contact.
How to recognize a risky encounter
Look for a dark caterpillar with four creamy brush-like tufts on its back and two long black hair pencils projecting from its head.
What to do
Do not touch the caterpillars or silk cocoons with bare skin; gently rinse the area with cool water and soap if accidentally exposed.
Responsible observation
  • Finding Females: Check tree trunks and wooden fences in late summer for wingless females sitting on their cocoons.
  • Safe Observation: Photograph caterpillars with a macro lens to admire their vivid colors without touching the urticating hairs.
  • Watching Males: Look for day-flying males zigzagging over sunny hedgerows as they track female scent plumes.
Related species
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