Virginia Tiger Moth

The Virginia tiger moth is a common North American member of the tiger moth subfamily (Arctiinae), part of the larger Erebidae family. Adults are notable for their clean, almost entirely white appearance, broken only by a scattering of small black spots, giving them a simple but elegant look compared to many more boldly patterned relatives.

Its caterpillar, widely known as the yellow woolly bear, is one of the most frequently seen fuzzy caterpillars in gardens and fields across the continent, ranging in color from pale cream to golden yellow and covered in dense, soft-looking hairs. Because of its abundance and generalist feeding habits, it is a familiar sight to gardeners throughout the growing season.

The species plays an ordinary but important ecological role as both a plant-feeding larva and, as an adult, a nocturnal flier and food source within its habitat, contributing to the food web that supports birds and other predators.

• Adult wings are predominantly satiny white with a small number of scattered black dots, most often on the forewings and thorax.
• The abdomen is white or pale yellow, sometimes with a faint row of black spots along the top.
• Body is stout and moth-like with a dense covering of fine hair-like scales.
• Larvae (yellow woolly bears) are covered in long, soft, pale golden to yellow-tan hairs of fairly uniform color, distinguishing them from the banded black-and-rust pattern of the true woolly bear.
• Lookalikes include other white Spilosoma and Hyphantria species; the sparse, small black dotting pattern helps separate this species from close relatives.

Common across most of the United States and southern Canada in gardens, meadows, woodland edges, and along roadsides. Adults fly at night from late spring through summer and are frequently drawn to porch lights, while caterpillars are most visible from mid to late summer as they feed and later wander in search of pupation sites.

Adults are nocturnal, resting by day on vegetation or structures and becoming active after dusk, when they are attracted to artificial lights. The caterpillars are generalist herbivores that feed on a broad range of low plants, garden vegetables, and weeds, occasionally becoming numerous enough to be noticed defoliating small patches of foliage. Both life stages provide food for birds, small mammals, and predatory or parasitic insects within their ecosystem.

Eggs are laid in clusters on host plant leaves and hatch into small hairy larvae that molt several times while growing. Mature caterpillars spin a loose cocoon woven from silk and their own body hairs, typically in leaf litter or soil, where they pupate. The species overwinters as a pupa in colder regions, with adults emerging in late spring; two generations commonly occur per year across much of its range.