Zebra longwing vs Julia butterfly
These two are easy to mix up. Here's how to tell a zebra longwing from a Julia butterfly, and whether either one bites or stings.
Zebra longwing
Heliconius charithonia
Julia butterfly
Dryas iulia
≠The key differences
Dryas iulia is mostly bright orange with black markings rather than black with yellow stripes; wing shape is broader and less striped.
⚖︎Side by side
| Zebra longwing | Julia butterfly | |
|---|---|---|
| To humans | Harmless to people | Non-toxic |
| Size | 7-10 cm wingspan | Wingspan about 80-90 mm |
| Colours | Black, Yellow, Cream, Green (chrysalis) | Bright orange, Reddish orange, Pale orange-brown (underside), Dark brown (small markings) |
| Family | Nymphalidae | Nymphalidae |
| Habitat | Open woodlands, forest edges, hedgerows, gardens and areas where passionflower vines grow. | Open, sunny habitats: edges of woodlands, gardens, hedgerows, roadsides, disturbed areas, and places where host passion vines grow. |
| Range | Southern United States (Florida, southern Texas; strays farther north), the Caribbean, Mexico and Central America south to northern South America. | Neotropics from South America through Central America and the Caribbean; reaches southern United States (Florida and southern Texas) where it may breed or appear seasonally. |
| Active | Year-round in tropical regions; in subtropical/temperate parts of its range mainly spring to fall. Active during daylight, especially mid-morning to late afternoon. | Year-round in tropical regions; spring to autumn in temperate parts. Diurnal—active in daylight, especially mid-morning to afternoon. |
| Pest? | No | No |
🔍How to spot a zebra longwing
- Long, narrow wings with multiple narrow yellow or cream lengthwise stripes on a black background.
- Wingspan around 7-10 cm and a slender body compared with many other nymphalids.
- Caterpillars white with black spots and black spines; look for them on passionflower vines.
- Roosting in small to large communal groups at dusk is characteristic behavior.
🔍How to spot a Julia butterfly
- Uniform bright orange upperwings with elongated, narrow forewings and a pointed forewing tip.
- Lack of heavy dark bands or extensive eyespots on the upper surface (unlike many fritillaries).
- Long, narrow wing shape and swift, direct flight.
- Underside paler orange to brownish, without striking silver spots.
?Frequently asked questions
What is the difference between a zebra longwing and a Julia butterfly?
Dryas iulia is mostly bright orange with black markings rather than black with yellow stripes; wing shape is broader and less striped.
Is a zebra longwing or a Julia butterfly more dangerous?
Zebra longwing: Harmless to people. Julia butterfly: Non-toxic. Adults and caterpillars are not dangerous to people. Julia butterflies are harmless to people.
Identification from photos is never certain: don't handle insects you can't identify, and get medical advice for bites, stings or allergic reactions.