Painted Lady Caterpillar

The painted lady caterpillar is the larval stage of one of the most widely distributed butterflies in the world, found on every continent except Antarctica and South America (with sporadic strays). Its adaptability to a broad range of host plants and climates has made it a familiar sight in gardens, farmland, and open habitats globally.

The caterpillar constructs loose silk shelters on its host plants, a behavior that both protects it from predators and helps identify its presence even before the caterpillar itself is spotted.

• Body is dark, mottled gray, brown, or black with a broken yellowish stripe along each side
• Covered in rows of branched, bristly black spines (scoli) that are not stiff enough to be sharp
• Head is black and relatively small
• Body tapers slightly at both ends and can appear segmented and bumpy
• Often found within a loose silk web tented over host plant leaves
• Similar to other nymphalid caterpillars but identifiable by its association with thistle, mallow, or hollyhock and its silk shelter

Painted lady caterpillars occur nearly worldwide, including throughout North America, Europe, Asia, and Africa, in open sunny habitats such as fields, meadows, gardens, and roadsides. They are especially common wherever thistles, mallows, or hollyhocks grow, and populations can surge dramatically during migratory years.

The caterpillar spins a loose, messy silk web over the leaves of its host plant, sheltering within it while it feeds, which helps protect it from many predators and weather extremes. It feeds on a very wide range of plants, most notably thistles and mallow family plants, making it a highly adaptable generalist among butterfly larvae. This flexibility contributes to the adult painted lady butterfly's fame as one of the great insect migrants, undertaking long-distance movements across continents.

Females lay small pale green eggs singly on host leaves. The larva develops through five instars over roughly two to three weeks, spinning successive silk shelters as it grows and moves to fresh foliage. The mature caterpillar forms a chrysalis, often suspended within or near its silk web, from which the adult emerges after one to two weeks. The species does not typically overwinter in cold regions but instead recolonizes northern areas each year through migration, producing multiple generations during the warm season.