Zebra Longwing Caterpillar Identification Guide
Identify the zebra longwing caterpillar by its pale body, black spots, and branching spines on passionflower vines.
Read the full Zebra Longwing Caterpillar encyclopedia entry →
Key Visual Features
The zebra longwing caterpillar is the larval stage of Heliconius charithonia, a distinctive long-winged butterfly.
- Size: reaches about 1.5 inches long when fully grown.
- Color: pale white to cream-colored body, giving strong contrast against its host plant foliage.
- Markings: scattered black spots or short dashes cover the body in an irregular pattern.
- Spines: rows of black, branching spines project from the body, giving it a bristly, spiky look despite not being dangerous to handle carelessly.
- Body shape: elongated and cylindrical, with a small dark head capsule.
Where and When You'd See It
- Found exclusively on passionflower vines (Passiflora species), the sole host plant for this species.
- Active year-round in warm subtropical and tropical climates, with generations overlapping continuously where passionflower grows year-round.
- Larvae feed on leaves, tendrils, and sometimes flower buds, often leaving visibly chewed foliage.
- Common in gardens, hammocks, and natural areas within its range, especially the southeastern United States, Mexico, and Central America.
Similar-Looking Bugs
- Gulf fritillary caterpillar: bright orange with black branching spines, easily separated from the pale white body of the zebra longwing caterpillar.
- Julia butterfly caterpillar: reddish-orange with black spines, again distinguished by its warmer body color compared to the whitish zebra longwing larva.
- Variegated fritillary caterpillar: orange-red with white stripes and black spines, found on different host plants and lacking the pale cream base color.
Behavior Notes
Because passionflower vines can be scarce in some areas, larvae are sometimes found in clusters on a single vine, having stripped nearby leaves before wandering to find fresh growth. Adults of this species are also notable for a slow, fluttering flight and long lifespan compared to most butterflies, and eggs are typically laid singly or in small groups on new leaf tips and tendrils rather than in large clusters.
Quick ID Checklist
- Pale white to cream body with scattered black spots
- Rows of black branching spines
- Found only on passionflower vines
- Elongated cylindrical shape, about 1.5 inches at maturity
- Active nearly year-round in warm climates
Frequently asked questions
What plant does the zebra longwing caterpillar feed on?
It feeds exclusively on passionflower vines (Passiflora species), which serve as its only host plant.
What color is a zebra longwing caterpillar?
It has a pale white to cream-colored body marked with scattered black spots and black branching spines.
How can I tell a zebra longwing caterpillar from a Gulf fritillary caterpillar?
The zebra longwing larva is pale white to cream, while the Gulf fritillary caterpillar is bright orange, though both have similar branching black spines.
When can zebra longwing caterpillars be found?
In warm subtropical and tropical areas they can be found nearly year-round wherever passionflower vines grow.