Animal field guide
Great Crow
Euploea phaenareta
The Great Crow butterfly flies slowly and openly in plain sight, which only works because it is genuinely unpalatable. Its dark wings and white spotting are a signal other butterflies have converged on, so the warning gets stronger the more species share it.
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Get AnimalDexGreat Crow at a glance
Animal · Native range keys: southeast_asia · Relatively common
Known for: Large dark brown to black wings with a soft blue or, Rows of white spots along the wing margins, Slow, Males carry hair-pencils extruded from the abdomen
Understand the animal
Understand the Great Crow
Factual biology first: what this animal is like, where it lives, how it survives, and why those traits exist.
01
Introduction to Great Crow
The Great Crow butterfly flies slowly and openly in plain sight, which only works because it is genuinely unpalatable. Its dark wings and white spotting are a signal other butterflies have converged on, so the warning gets stronger the more species share it.
How to identify a Great Crow
- Large dark brown to black wings with a soft blue or purple sheen
- Rows of white spots along the wing margins
- Slow, deliberate flapping flight, unbothered and low
- Males carry hair-pencils extruded from the abdomen tip when courting
Why Great Crow are interesting
- Adults take pyrrolizidine alkaloids from Apocynaceae and Asteraceae plants and store them, which makes them genuinely distasteful to birds.
- Crows are models in a Mullerian mimicry ring, not mimics of it — several unrelated distasteful butterflies converge on the same dark, white-spotted pattern, so every one of them benefits.
- Males use those same stored alkaloids to build the pheromone released from their hair-pencils during courtship.
- The species roosts communally in the dry season, sometimes in large aggregations in sheltered gullies.
- Larvae feed on figs and other latex-bearing trees, cutting leaf veins first to drain the sticky sap before eating.
02
Adaptations and biological abilities
03
Why does Great Crow behave this way?
- Large dark brown to black wings with a soft blue or purple sheen
- Rows of white spots along the wing margins
- Slow, deliberate flapping flight, unbothered and low
- Males carry hair-pencils extruded from the abdomen tip when courting
Active by day and roosts overnight in vegetation, gathering in sheltered communal roosts through the dry season.
04
Why Native range keys: southeast_asia?
Habitat: Native range keys: southeast_asia, south_asia, australia_oceania. Coastal forest, mangrove edge, gardens and secondary growth where its larval fig and Apocynaceae hosts grow. Open, well-lit habitat suits a butterfly that does not need to hide.
Native range: Native range keys: southeast_asia, south_asia, australia_oceania. Coastal forest, mangrove edge, gardens and secondary growth where its larval fig and Apocynaceae hosts grow. Open, well-lit habitat suits a butterfly that does not need to hide.
Native range
Natural range, not this specific capture location.
Native range keys: southeast_asia, south_asia, australia_oceania. Coastal forest, mangrove edge, gardens and secondary growth where its larval fig and Apocynaceae hosts grow. Open, well-lit habitat suits a butterfly that does not need to hide.
05
Why this diet?
Adults take nectar and, distinctively, dried plant material and withered Heliotropium and Crotalaria for the alkaloids themselves. Larvae feed on figs and related latex-bearing trees. The adult diet is where the defence and the courtship pheromone both come from.
06
Activity, rest, and lifespan
Active by day and roosts overnight in vegetation, gathering in sheltered communal roosts through the dry season.
Adults live several weeks to a few months, considerably longer than most butterflies of similar size, helped by having few pursuers.
07
Great Crow reproduction
Eggs are laid singly on the underside of host leaves. Larvae are conspicuously banded rather than camouflaged, carrying the same honest-signal strategy the adults use.
Males and females look similar; males are recognised by the paired hair-pencils they push out from the abdomen tip when courting, and often by a slightly stronger blue sheen.
08
Predators, threats, and defense
Few birds pursue an adult after one attempt. Larvae and pupae are taken by wasps and ants, and the slow adult flight only remains safe where local birds have already learned the pattern.
09
Conservation and rarity
Rarity: Relatively common · 15/100. AnimalDex canonical rarity score: 15/100, maintained by the live indexed species profile.
- Observe from a respectful distance and avoid changing the animal's behavior.
- Do not block feeding, shelter, nesting, or travel routes.
- Use a live camera capture without handling or staging wildlife.
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Where to find them
Where to find Great Crow
To find Great Crow in the wild, focus on the exact habitat patches that match its body design and daily behavior, not just the broad country where it exists. You usually do better by working one good piece of habitat inside native range keys: southeast_asia, south_asia, australia_oceania. Coastal forest, mangrove edge, gardens and secondary growth where its larval fig and Apocynaceae hosts grow. Open, well-lit habitat suits a butterfly that does not need to hide. than by covering too much ground.
- Quiet marsh edges, reedbeds, river bends, or shallow wetland margins
- Forest edge, canopy gaps, fruiting trees, or shaded trails where cover and food meet
- Headlands, reef edges, island colonies, tidal channels, or productive coastal water
Animal field guide
Great Crow
The Great Crow butterfly flies slowly and openly in plain sight, which only works because it is genuinely unpalatable. Its dark wings and white spotting are a signal other butterflies have converged on, so the warning gets stronger the more species share it.
Native range
Natural range, not this capture location
Native range keys: southeast_asia, south_asia, australia_oceania. Coastal forest, mangrove edge, gardens and secondary growth where its larval fig and Apocynaceae hosts grow. Open, well-lit habitat suits a butterfly that does not need to hide.
Search near meAnimalDex stats
Dominance
20
Speed
30
Size
12
Intelligence
25
Rarity
15%
Total
102
Size scale
Scientific name
Euploea phaenareta
Category
Animal
Habitat
Native range keys: southeast_asia, south_asia, australia_oceania. Coastal forest, mangrove edge, gardens and secondary growth where its larval fig and Apocynaceae hosts grow. Open, well-lit habitat suits a butterfly that does not need to hide.
Rarity
Relatively common · 15/100
Native range
Native range keys: southeast_asia, south_asia, australia_oceania. Coastal forest, mangrove edge, gardens and secondary growth where its larval fig and Apocynaceae hosts grow. Open, well-lit habitat suits a butterfly that does not need to hide.
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